| 712500 | = | 10000 | x | − | 10000 | x | ( | 1 | + | 5 100 | ) | − | 712500 |
| 方程右边 = | 10000 | x | − | 10000 | x | × | 1 | − | 10000 | x | × | 5 100 | − | 712500 |
| = | 10000 | x | − | 10000 | x | − | 500 | x | − | 712500 |
| = | - | 500 | x | − | 712500 |
| 712500 | = | - | 500 | x | − | 712500 |
| 500 | x | = | - | 712500 | − | 712500 |
| 500 | x | = | - | 1425000 |
| x | = | - | 1425000 | ÷ | 500 |
| = | - | 1425000 | × | 1 500 |
| = | - | 2850 | × | 1 |
| x | = | - | 2850 |