| ( | x | − | 4 | ) | ÷ | 2 | = | 3 5 | x | − | 12 5 |
| 方程左边 = | x | × | 1 2 | − | 4 | × | 1 2 |
| = | x | × | 1 2 | − | 2 |
1 2 | x | − | 2 | = | 3 5 | x | − | 12 5 |
1 2 | x | − | 3 5 | x | = | - | 12 5 | + | 2 |
| - | 1 10 | x | = | - | 12 5 | + | 2 |
| - | 1 10 | x | = | - | 2 5 |
2 5 | = | 1 10 | x |
1 10 | x | = | 2 5 |
| x | = | 2 5 | ÷ | 1 10 |
| = | 2 5 | × | 10 |
| = | 2 | × | 2 |
| x | = | 4 |
| 5 | ( | x | − | 4 | ) | = | 6 | x | − | 12 5 |
| 方程左边 = | 5 | x | − | 5 | × | 4 |
| = | 5 | x | − | 20 |
| 5 | x | − | 20 | = | 6 | x | − | 12 5 |
| 5 | x | − | 6 | x | = | - | 12 5 | + | 20 |
| - | x | = | - | 12 5 | + | 20 |
| - | x | = | - | 12 5 | + | 20 |
| - | x | = | 88 5 |
| - | 88 5 | = | x |
| x | = | - | 88 5 |