| 9000 | ( | 1 | − | 1 50 | ) | = | x | ( | 1 | − | 1 500 | ) |
| 方程左边 = | 9000 | × | 1 | − | 9000 | × | 1 50 |
| = | 9000 | − | 180 |
| = | 8820 |
| 8820 | = | x | ( | 1 | − | 1 500 | ) |
| 方程右边 = | x | × | 1 | − | x | × | 1 500 |
| = | 499 500 | x |
| 8820 | = | 499 500 | x |
| - | 499 500 | x | = | - | 8820 |
| 8820 | = | 499 500 | x |
499 500 | x | = | 8820 |
| x | = | 8820 | ÷ | 499 500 |
| = | 8820 | × | 500 499 |
| x | = | 4410000 499 |
| x | = | 8837.675351 |