| x | ÷ | 8000 | + | ( | 40000 | − | x | ) | ÷ | 500 | = | 50 |
| 方程左边 = | 1 8000 | x | + | 40000 | × | 1 500 | − | x | × | 1 500 |
| = | 1 8000 | x | + | 80 | − | x | × | 1 500 |
| = | - | 3 1600 | x | + | 80 |
| - | 3 1600 | x | + | 80 | = | 50 |
| - | 3 1600 | x | = | 50 | − | 80 |
| - | 3 1600 | x | = | - | 30 |
| 30 | = | 3 1600 | x |
3 1600 | x | = | 30 |
| x | = | 30 | ÷ | 3 1600 |
| = | 30 | × | 1600 3 |
| = | 10 | × | 1600 |
| x | = | 16000 |