| 9000 | − | ( | 260 | − | x | ) | × | 50 | = | 50 | ( | 1 | − | 1 2 | ) | x |
| 方程左边 = | 9000 | − | 260 | × | 50 | + | x | × | 50 |
| = | 9000 | − | 13000 | + | x | × | 50 |
| = | - | 4000 | + | 50 | x |
| - | 4000 | + | 50 | x | = | 50 | ( | 1 | − | 1 2 | ) | x |
| 方程右边 = | 50 | × | 1 | x | − | 50 | × | 1 2 | x |
| = | 50 | x | − | 25 | x |
| = | 25 | x |
| - | 4000 | + | 50 | x | = | 25 | x |
| 50 | x | − | 25 | x | = | 4000 |
| 25 | x | = | 4000 |
| x | = | 4000 | ÷ | 25 |
| = | 4000 | × | 1 25 |
| = | 160 | × | 1 |
| x | = | 160 |