| 266500 | ÷ | x | + | ( | 266500 | − | 20 | x | ) | ÷ | x | + | 20 | = | 68 |
| 方程两边同时乘以: | x |
| 266500 | + | ( | 266500 | − | 20 | x | ) | ÷ | 1 | × | 1 | + | 20 | x | = | 68 | x |
| 266500 | + | 266500 | ÷ | 1 | × | 1 | − | 20 | x | ÷ | 1 | × | 1 | + | 20 | x | = | 68 | x |
| 266500 | + | 266500 | − | 20 | x | + | 20 | x | = | 68 | x |
| 533000 | − | 0 | x | = | 68 | x |
| - | 68 | x | = | - | 533000 |
| 533000 | = | 68 | x |
| 68 | x | = | 533000 |
| x | = | 533000 | ÷ | 68 |
| = | 533000 | × | 1 68 |
| = | 133250 | × | 1 17 |
| x | = | 133250 17 |
| x | = | 7838.235294 |