| ( | 252 | − | x | ) | × | 7 | ÷ | 3 | − | x | = | 8 |
| 方程左边 = | ( | 252 | − | x | ) | × | 7 3 | − | x |
| ( | 252 | − | x | ) | × | 7 3 | − | x | = | 8 |
| 方程左边 = | 252 | × | 7 3 | − | x | × | 7 3 | − | x |
| = | 588 | − | x | × | 7 3 | − | x |
| = | 588 | − | 10 3 | x |
| 588 | − | 10 3 | x | = | 8 |
| - | 10 3 | x | = | 8 | − | 588 |
| - | 10 3 | x | = | - | 580 |
| 580 | = | 10 3 | x |
10 3 | x | = | 580 |
| x | = | 580 | ÷ | 10 3 |
| = | 580 | × | 3 10 |
| = | 58 | × | 3 |
| x | = | 174 |