| ( | ( | x | − | 7 | ) | ÷ | 3 | ) | − | ( | ( | 1 | + | x | ) | ÷ | 2 | ) | = | 1 |
| 方程左边 = | ( | x | − | 7 | ) | ÷ | 3 | − | ( | ( | 1 | + | x | ) | ÷ | 2 | ) |
| = | x | × | 1 3 | − | 7 | × | 1 3 | − | ( | ( | 1 | + | x | ) | ÷ | 2 | ) |
| = | x | × | 1 3 | − | 7 3 | − | ( | ( | 1 | + | x | ) | ÷ | 2 | ) |
| = | 1 3 | x | − | 7 3 | − | ( | 1 | + | x | ) | ÷ | 2 |
| = | 1 3 | x | − | 7 3 | − | 1 | × | 1 2 | − | x | × | 1 2 |
| = | 1 3 | x | − | 7 3 | − | 1 2 | − | x | × | 1 2 |
| = | - | 1 6 | x | − | 17 6 |
| - | 1 6 | x | − | 17 6 | = | 1 |
| - | 1 6 | x | = | 1 | + | 17 6 |
| - | 1 6 | x | = | 23 6 |
| - | 23 6 | = | 1 6 | x |
1 6 | x | = | - | 23 6 |
| x | = | - | 23 6 | ÷ | 1 6 |
| = | - | 23 6 | × | 6 |
| = | - | 23 | × | 1 |
| x | = | - | 23 |