| 2 | ( | x | − | 2 | ) | = | 3 | ( | 4 | x | − | 1 | ) | + | 9 |
| 方程左边 = | 2 | x | − | 2 | × | 2 |
| = | 2 | x | − | 4 |
| 2 | x | − | 4 | = | 3 | ( | 4 | x | − | 1 | ) | + | 9 |
| 方程右边 = | 3 | × | 4 | x | − | 3 | × | 1 | + | 9 |
| = | 12 | x | − | 3 | + | 9 |
| = | 12 | x | + | 6 |
| 2 | x | − | 4 | = | 12 | x | + | 6 |
| 2 | x | − | 12 | x | = | 6 | + | 4 |
| - | 10 | x | = | 6 | + | 4 |
| - | 10 | x | = | 10 |
| - | 10 | = | 10 | x |
| 10 | x | = | - | 10 |
| x | = | - | 10 | ÷ | 10 |
| = | - | 10 | × | 1 10 |
| = | - | 1 | × | 1 |
| x | = | - | 1 |