| 4 | − | 4 | ( | x | − | 3 | ) | = | 2 | ( | 9 | − | x | ) |
| 方程左边 = | 4 | − | 4 | x | + | 4 | × | 3 |
| = | 4 | − | 4 | x | + | 12 |
| = | 16 | − | 4 | x |
| 16 | − | 4 | x | = | 2 | ( | 9 | − | x | ) |
| 方程右边 = | 2 | × | 9 | − | 2 | x |
| = | 18 | − | 2 | x |
| 16 | − | 4 | x | = | 18 | − | 2 | x |
| - | 4 | x | + | 2 | x | = | 18 | − | 16 |
| - | 2 | x | = | 18 | − | 16 |
| - | 2 | x | = | 2 |
| - | 2 | = | 2 | x |
| 2 | x | = | - | 2 |
| x | = | - | 2 | ÷ | 2 |
| = | - | 2 | × | 1 2 |
| = | - | 1 | × | 1 |
| x | = | - | 1 |