| 500 | × | 200 | = | 450 | x | + | ( | 500 | − | x | ) | × | 155 |
| 方程左边 = | 100000 |
| 100000 | = | 450 | x | + | ( | 500 | − | x | ) | × | 155 |
| 方程右边 = | 450 | x | + | 500 | × | 155 | − | x | × | 155 |
| = | 450 | x | + | 77500 | − | x | × | 155 |
| = | 295 | x | + | 77500 |
| 100000 | = | 295 | x | + | 77500 |
| - | 295 | x | = | 77500 | − | 100000 |
| - | 295 | x | = | - | 22500 |
| 22500 | = | 295 | x |
| 295 | x | = | 22500 |
| x | = | 22500 | ÷ | 295 |
| = | 22500 | × | 1 295 |
| = | 4500 | × | 1 59 |
| x | = | 4500 59 |
| x | = | 76.271186 |