| 2 | ÷ | 1 | × | ( | x | − | 1 | ) | = | 2 | − | 5 | ÷ | 1 | × | ( | x | + | 2 | ) |
| 方程左边 = | 2 | ( | x | − | 1 | ) |
| 2 | ( | x | − | 1 | ) | = | 2 | − | 5 | ÷ | 1 | × | ( | x | + | 2 | ) |
| 方程左边 = | 2 | x | − | 2 | × | 1 |
| = | 2 | x | − | 2 |
| 2 | x | − | 2 | = | 2 | − | 5 | ÷ | 1 | × | ( | x | + | 2 | ) |
| 方程右边 = | 2 | − | 5 | ( | x | + | 2 | ) |
| 2 | x | − | 2 | = | 2 | − | 5 | ( | x | + | 2 | ) |
| 方程右边 = | 2 | − | 5 | x | − | 5 | × | 2 |
| = | 2 | − | 5 | x | − | 10 |
| = | - | 8 | − | 5 | x |
| 2 | x | − | 2 | = | - | 8 | − | 5 | x |
| 2 | x | + | 5 | x | = | - | 8 | + | 2 |
| 7 | x | = | - | 8 | + | 2 |
| 7 | x | = | - | 6 |
| x | = | - | 6 | ÷ | 7 |
| = | - | 6 | × | 1 7 |
| x | = | - | 6 7 |
| x | = | - 0.857143 |