| x | − | 2 | x | − | 1 | − | ( | 2 | x | − | 1 | ) | ÷ | 2 | − | 1 | = | 3 |
| 方程左边 = | - | 1 | x | − | 2 | − | ( | 2 | x | − | 1 | ) | × | 1 2 |
| - | 1 | x | − | 2 | − | ( | 2 | x | − | 1 | ) | × | 1 2 | = | 3 |
| 方程左边 = | - | 1 | x | − | 2 | − | 2 | x | × | 1 2 | + | 1 | × | 1 2 |
| = | - | 1 | x | − | 2 | − | 1 | x | + | 1 2 |
| = | - | 2 | x | − | 3 2 |
| - | 2 | x | − | 3 2 | = | 3 |
| - | 2 | x | = | 3 | + | 3 2 |
| - | 2 | x | = | 9 2 |
| - | 9 2 | = | 2 | x |
| 2 | x | = | - | 9 2 |
| x | = | - | 9 2 | ÷ | 2 |
| = | - | 9 2 | × | 1 2 |
| x | = | - | 9 4 |
| x | = | - 2.25 |