3 10 | = | ( | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | ) | ÷ | ( | 1 | − | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | ) |
| 方程两边同时乘以: | ( | 1 | − | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | ) |
3 10 | ( | 1 | − | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | ) | = | ( | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | ) |
3 10 | × | 1 | − | 3 10 | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | = | ( | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | ) |
3 10 | × | 1 | − | 3 10 | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 | = | x | × | 4000 | ÷ | 270 | × | 40 | ÷ | 100 | × | 270 | ÷ | 192 |
3 10 | − | 5 2 | x | = | x | × | 25 3 |
| - | 5 2 | x | − | 25 3 | x | = | - | 3 10 |
| - | 65 6 | x | = | - | 3 10 |
3 10 | = | 65 6 | x |
65 6 | x | = | 3 10 |
| x | = | 3 10 | ÷ | 65 6 |
| = | 3 10 | × | 6 65 |
| = | 3 5 | × | 3 65 |
| x | = | 9 325 |
| x | = | 0.027692 |