| x | = | ( | x | ÷ | 180 | + | 2 | ) | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) |
| x | = | x | ÷ | 180 | × | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) |
| x | = | x | × | 1 180 | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | x | × | 1 180 | × | 20 | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) |
| x | = | x | × | 1 60 | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | + | x | × | 1 9 | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) |
| x | = | x | × | 1 60 | × | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | + | 1 9 | x | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) |
| x | = | x | × | 6 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | + | 1 9 | x | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) |
| 方程两边同时乘以: | ( | x | ÷ | 180 | + | 2 | ) |
| x | ( | x | ÷ | 180 | + | 2 | ) | = | x | × | 6 | + | 1 9 | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | ÷ | 180 | + | x | × | 2 | = | x | × | 6 | + | 1 9 | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | ÷ | 180 | + | x | × | 2 | = | x | × | 6 | + | 1 9 | x | x | ÷ | 180 | + | 1 9 | x | × | 2 | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | + | x | × | 2 | = | x | × | 6 | + | 1 1620 | x | x | + | 2 9 | x | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | + | 2 | x | = | 56 9 | x | + | 1 1620 | x | x | + | 2 | ( | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | + | 20 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | + | 2 | x | = | 56 9 | x | + | 1 1620 | x | x | + | 2 | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | × | 3 | ( | x | ÷ | 180 | + | 2 | ) | + | 2 | × | 20 | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | + | 2 | x | = | 56 9 | x | + | 1 1620 | x | x | + | 6 | ( | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | ) | ( | x | ÷ | 180 | + | 2 | ) | + | 40 | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | + | 2 | x | = | 56 9 | x | + | 1 1620 | x | x | + | 6 | × | 360 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | × | ( | x | ÷ | 180 | + | 2 | ) | + | 40 | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | + | 2 | x | = | 56 9 | x | + | 1 1620 | x | x | + | 2160 | ÷ | ( | x | ÷ | 180 | + | 2 | ) | × | ( | x | ÷ | 180 | + | 2 | ) | + | 40 | ( | x | ÷ | 180 | + | 2 | ) |
| 方程两边同时乘以: | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | ( | x | ÷ | 180 | + | 2 | ) | + | 2 | x | ( | x | ÷ | 180 | + | 2 | ) | = | 56 9 | x | ( | x | ÷ | 180 | + | 2 | ) | + | 1 1620 | x | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2160 | ( | x | ÷ | 180 | + | 2 | ) | + | 40 | ( | x | ÷ | 180 | + | 2 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | x | ÷ | 180 | + | x | x | × | 1 180 | × | 2 | + | 2 | x | ( | x | ÷ | 180 | + | 2 | ) | = | 56 9 | x | ( | x | ÷ | 180 | + | 2 | ) | + | 1 1620 | x | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2160 | ( | x | ÷ | 180 | + | 2 | ) | + | 40 | ( | x | ÷ | 180 | + | 2 | ) | ( | x | ÷ | 180 | + | 2 | ) |
| x | x | × | 1 180 | x | ÷ | 180 | + | x | x | × | 1 180 | × | 2 | + | 2 | x | ( | x | ÷ | 180 | + | 2 | ) | = | 56 9 | x | x | ÷ | 180 | + | 56 9 | x | × | 2 | + | 1 1620 | x | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2160 |
| x | x | × | 1 32400 | x | + | x | x | × | 1 90 | + | 2 | x | ( | x | ÷ | 180 | + | 2 | ) | = | 14 405 | x | x | + | 112 9 | x | + | 1 1620 | x | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2160 | ( | x | ÷ | 180 | + | 2 | ) | + | 40 |
| x | x | × | 1 32400 | x | + | x | x | × | 1 90 | + | 2 | x | x | ÷ | 180 | + | 2 | = | 14 405 | x | x | + | 112 9 | x | + | 1 1620 | x | x | ( | x | ÷ | 180 | + | 2 | ) | + | 2160 | ( | x | ÷ | 180 | + | 2 | ) | + | 40 |
| x | x | × | 1 32400 | x | + | x | x | × | 1 90 | + | 2 | x | x | ÷ | 180 | + | 2 | = | 14 405 | x | x | + | 112 9 | x | + | 1 1620 | x | x | x | ÷ | 180 | + | 1 1620 | x |
| x | x | × | 1 32400 | x | + | x | x | × | 1 90 | + | 1 90 | x | x | + | 4 | x | = | 14 405 | x | x | + | 112 9 | x | + | 1 291600 | x | x | x | + | 1 810 | x | x |
| x | x | × | 1 32400 | x | + | x | x | × | 1 90 | + | 1 90 | x | x | + | 4 | x | = | 14 405 | x | x | + | 112 9 | x | + | 1 291600 | x | x | x | + | 1 810 | x | x |
| x | x | × | 1 32400 | x | + | x | x | × | 1 90 | + | 1 90 | x | x | + | 4 | x | = | 14 405 | x | x | + | 112 9 | x | + | 1 291600 | x | x | x | + | 1 810 | x | x |