| 5 | ( | x | − | 3 | ) | ÷ | 2 | = | 20 |
| 方程左边 = | 5 2 | ( | x | − | 3 | ) |
5 2 | ( | x | − | 3 | ) | = | 20 |
| 方程左边 = | 5 2 | x | − | 5 2 | × | 3 |
| = | 5 2 | x | − | 15 2 |
5 2 | x | − | 15 2 | = | 20 |
5 2 | x | = | 20 | + | 15 2 |
5 2 | x | = | 55 2 |
| x | = | 55 2 | ÷ | 5 2 |
| = | 55 2 | × | 2 5 |
| = | 11 | × | 1 |
| x | = | 11 |
| 24 | − | 7 | x | = | 4 | x | + | 2 |
| - | 7 | x | − | 4 | x | = | 2 | − | 24 |
| - | 11 | x | = | 2 | − | 24 |
| - | 11 | x | = | - | 22 |
| 22 | = | 11 | x |
| 11 | x | = | 22 |
| x | = | 22 | ÷ | 11 |
| = | 22 | × | 1 11 |
| = | 2 | × | 1 |
| x | = | 2 |