| x | − | ( | x | − | 5 2 | ) | = | ( | 2 | x | − | 53 10 | ) | − | 3 |
| 方程左边 = | x | − | x | + | 5 2 |
| = | 0 | x | + | 5 2 |
5 2 | = | ( | 2 | x | − | 53 10 | ) | − | 3 |
| 方程右边 = | 2 | x | − | 53 10 | − | 3 |
| = | 2 | x | − | 83 10 |
5 2 | = | 2 | x | − | 83 10 |
| - | 2 | x | = | - | 83 10 | − | 5 2 |
| - | 2 | x | = | - | 54 5 |
54 5 | = | 2 | x |
| 2 | x | = | 54 5 |
| x | = | 54 5 | ÷ | 2 |
| = | 54 5 | × | 1 2 |
| = | 27 5 | × | 1 |
| x | = | 27 5 |
| x | = | 5.4 |