| - | 2 | ( | x | − | 3 | ) | ÷ | 3 | = | 12 | − | 4 | ( | x | − | 3 | ) | ÷ | 7 |
| 方程左边 = | - | 2 3 | ( | x | − | 3 | ) |
| - | 2 3 | ( | x | − | 3 | ) | = | 12 | − | 4 | ( | x | − | 3 | ) | ÷ | 7 |
| 方程左边 = | - | 2 3 | x | + | 2 3 | × | 3 |
| = | - | 2 3 | x | + | 2 |
| - | 2 3 | x | + | 2 | = | 12 | − | 4 | ( | x | − | 3 | ) | ÷ | 7 |
| 方程右边 = | 12 | − | 4 7 | ( | x | − | 3 | ) |
| - | 2 3 | x | + | 2 | = | 12 | − | 4 7 | ( | x | − | 3 | ) |
| 方程右边 = | 12 | − | 4 7 | x | + | 4 7 | × | 3 |
| = | 12 | − | 4 7 | x | + | 12 7 |
| = | 96 7 | − | 4 7 | x |
| - | 2 3 | x | + | 2 | = | 96 7 | − | 4 7 | x |
| - | 2 3 | x | + | 4 7 | x | = | 96 7 | − | 2 |
| - | 2 21 | x | = | 96 7 | − | 2 |
| - | 2 21 | x | = | 82 7 |
| - | 82 7 | = | 2 21 | x |
2 21 | x | = | - | 82 7 |
| x | = | - | 82 7 | ÷ | 2 21 |
| = | - | 82 7 | × | 21 2 |
| = | - | 41 | × | 3 |
| x | = | - | 123 |