| x | − | ( | x | − | 1 | ) | ÷ | 2 | = | 2 | − | ( | x | + | 18 | ) | ÷ | 5 |
| 方程左边 = | x | − | x | × | 1 2 | + | 1 | × | 1 2 |
| = | x | − | x | × | 1 2 | + | 1 2 |
| = | 1 2 | x | + | 1 2 |
1 2 | x | + | 1 2 | = | 2 | − | ( | x | + | 18 | ) | ÷ | 5 |
| 方程右边 = | 2 | − | x | × | 1 5 | − | 18 | × | 1 5 |
| = | 2 | − | x | × | 1 5 | − | 18 5 |
| = | - | 8 5 | − | 1 5 | x |
1 2 | x | + | 1 2 | = | - | 8 5 | − | 1 5 | x |
1 2 | x | + | 1 5 | x | = | - | 8 5 | − | 1 2 |
7 10 | x | = | - | 8 5 | − | 1 2 |
7 10 | x | = | - | 21 10 |
| x | = | - | 21 10 | ÷ | 7 10 |
| = | - | 21 10 | × | 10 7 |
| = | - | 3 | × | 1 |
| x | = | - | 3 |