| ( | 20 | − | x | ) | ÷ | 15 | = | 129 5 | ÷ | ( | 429 5 | − | 529 10 | ) |
| 方程两边同时乘以: | ( | 429 5 | − | 529 10 | ) |
| ( | 20 | − | x | ) | ÷ | 15 | × | ( | 429 5 | − | 529 10 | ) | = | 129 5 |
| 20 | ÷ | 15 | × | ( | 429 5 | − | 529 10 | ) | − | x | ÷ | 15 | × | ( | 429 5 | − | 529 10 | ) | = | 129 5 |
4 3 | ( | 429 5 | − | 529 10 | ) | − | x | × | 1 15 | ( | 429 5 | − | 529 10 | ) | = | 129 5 |
4 3 | × | 429 5 | − | 4 3 | × | 529 10 | − | x | × | 1 15 | ( | 429 5 | − | 529 10 | ) | = | 129 5 |
572 5 | − | 1058 15 | − | x | × | 1 15 | ( | 429 5 | − | 529 10 | ) | = | 129 5 |
658 15 | − | x | × | 1 15 | ( | 429 5 | − | 529 10 | ) | = | 129 5 |
658 15 | − | x | × | 1 15 | × | 429 5 | + | x | × | 1 15 | × | 529 10 | = | 129 5 |
658 15 | − | x | × | 143 25 | + | x | × | 529 150 | = | 129 5 |
658 15 | − | 329 150 | x | = | 129 5 |
| - | 329 150 | x | = | 129 5 | − | 658 15 |
| - | 329 150 | x | = | - | 271 15 |
271 15 | = | 329 150 | x |
329 150 | x | = | 271 15 |
| x | = | 271 15 | ÷ | 329 150 |
| = | 271 15 | × | 150 329 |
| = | 271 | × | 10 329 |
| x | = | 2710 329 |
| x | = | 8.237082 |