| 500 | × | 9 10 | + | ( | x | − | 500 | ) | × | 4 5 | = | 466 |
| 方程左边 = | 450 | + | ( | x | − | 500 | ) | × | 4 5 |
| 450 | + | ( | x | − | 500 | ) | × | 4 5 | = | 466 |
| 方程左边 = | 450 | + | x | × | 4 5 | − | 500 | × | 4 5 |
| = | 450 | + | x | × | 4 5 | − | 400 |
| = | 50 | + | 4 5 | x |
| 50 | + | 4 5 | x | = | 466 |
4 5 | x | = | 466 | − | 50 |
4 5 | x | = | 416 |
| x | = | 416 | ÷ | 4 5 |
| = | 416 | × | 5 4 |
| = | 104 | × | 5 |
| x | = | 520 |