| 7 | ( | x | − | 2 | ) | = | 11 | + | 3 | ( | 3 | x | − | 5 | ) |
| 方程左边 = | 7 | x | − | 7 | × | 2 |
| = | 7 | x | − | 14 |
| 7 | x | − | 14 | = | 11 | + | 3 | ( | 3 | x | − | 5 | ) |
| 方程右边 = | 11 | + | 3 | × | 3 | x | − | 3 | × | 5 |
| = | 11 | + | 9 | x | − | 15 |
| = | - | 4 | + | 9 | x |
| 7 | x | − | 14 | = | - | 4 | + | 9 | x |
| 7 | x | − | 9 | x | = | - | 4 | + | 14 |
| - | 2 | x | = | - | 4 | + | 14 |
| - | 2 | x | = | 10 |
| - | 10 | = | 2 | x |
| 2 | x | = | - | 10 |
| x | = | - | 10 | ÷ | 2 |
| = | - | 10 | × | 1 2 |
| = | - | 5 | × | 1 |
| x | = | - | 5 |