| ( | 338769 | − | x | ) | ÷ | x | = | 129 100 |
| 方程两边同时乘以: | x |
| ( | 338769 | − | x | ) | = | 129 100 | x |
| 338769 | − | x | = | 129 100 | x |
| - | x | − | 129 100 | x | = | - | 338769 |
| - | 229 100 | x | = | - | 338769 |
| 338769 | = | 229 100 | x |
229 100 | x | = | 338769 |
| x | = | 338769 | ÷ | 229 100 |
| = | 338769 | × | 100 229 |
| x | = | 33876900 229 |
| x | = | 147934.061135 |