| 5 | ( | x | − | 1 | ) | − | 2 | ( | 3 | x | − | 1 | ) | = | 4 | x | − | 1 |
| 方程左边 = | 5 | x | − | 5 | × | 1 | − | 2 | ( | 3 | x | − | 1 | ) |
| = | 5 | x | − | 5 | − | 2 | ( | 3 | x | − | 1 | ) |
| = | 5 | x | − | 5 | − | 2 | × | 3 | x | + | 2 | × | 1 |
| = | 5 | x | − | 5 | − | 6 | x | + | 2 |
| = | - | 1 | x | − | 3 |
| - | 1 | x | − | 3 | = | 4 | x | − | 1 |
| - | 1 | x | − | 4 | x | = | - | 1 | + | 3 |
| - | 5 | x | = | - | 1 | + | 3 |
| - | 5 | x | = | 2 |
| - | 2 | = | 5 | x |
| 5 | x | = | - | 2 |
| x | = | - | 2 | ÷ | 5 |
| = | - | 2 | × | 1 5 |
| x | = | - | 2 5 |
| x | = | - 0.4 |