12 5 | − | ( | x | − | 4 | ) | ÷ | 2 | = | 3 | ÷ | 5 | × | x |
| 方程左边 = | 12 5 | − | x | × | 1 2 | + | 4 | × | 1 2 |
| = | 12 5 | − | x | × | 1 2 | + | 2 |
| = | 22 5 | − | 1 2 | x |
22 5 | − | 1 2 | x | = | 3 | ÷ | 5 | × | x |
| 方程右边 = | 3 5 | x |
22 5 | − | 1 2 | x | = | 3 5 | x |
| - | 1 2 | x | − | 3 5 | x | = | - | 22 5 |
| - | 11 10 | x | = | - | 22 5 |
22 5 | = | 11 10 | x |
11 10 | x | = | 22 5 |
| x | = | 22 5 | ÷ | 11 10 |
| = | 22 5 | × | 10 11 |
| = | 2 | × | 2 |
| x | = | 4 |