| 3 | x | − | 2 | ( | x | − | 1 | ) | = | 9 | − | 4 | ( | x | + | 3 | ) |
| 方程左边 = | 3 | x | − | 2 | x | + | 2 | × | 1 |
| = | 3 | x | − | 2 | x | + | 2 |
| = | 1 | x | + | 2 |
| 1 | x | + | 2 | = | 9 | − | 4 | ( | x | + | 3 | ) |
| 方程右边 = | 9 | − | 4 | x | − | 4 | × | 3 |
| = | 9 | − | 4 | x | − | 12 |
| = | - | 3 | − | 4 | x |
| 1 | x | + | 2 | = | - | 3 | − | 4 | x |
| 1 | x | + | 4 | x | = | - | 3 | − | 2 |
| 5 | x | = | - | 3 | − | 2 |
| 5 | x | = | - | 5 |
| x | = | - | 5 | ÷ | 5 |
| = | - | 5 | × | 1 5 |
| = | - | 1 | × | 1 |
| x | = | - | 1 |