| 5 | ( | 3 | x | − | 4 | ) | − | 2 | ( | x | − | 1 | ) | = | 5 | ( | x | − | 2 | ) |
| 方程左边 = | 5 | × | 3 | x | − | 5 | × | 4 | − | 2 | ( | x | − | 1 | ) |
| = | 15 | x | − | 20 | − | 2 | ( | x | − | 1 | ) |
| = | 15 | x | − | 20 | − | 2 | x | + | 2 | × | 1 |
| = | 15 | x | − | 20 | − | 2 | x | + | 2 |
| = | 13 | x | − | 18 |
| 13 | x | − | 18 | = | 5 | ( | x | − | 2 | ) |
| 方程右边 = | 5 | x | − | 5 | × | 2 |
| = | 5 | x | − | 10 |
| 13 | x | − | 18 | = | 5 | x | − | 10 |
| 13 | x | − | 5 | x | = | - | 10 | + | 18 |
| 8 | x | = | - | 10 | + | 18 |
| 8 | x | = | 8 |
| x | = | 8 | ÷ | 8 |
| = | 8 | × | 1 8 |
| = | 1 | × | 1 |
| x | = | 1 |