| x | ÷ | 2 | = | 18 | ( | x | − | 1 | ÷ | 3 | ) | ( | x | − | 1 | ÷ | 3 | ) |
| 方程右边 = | 18 | x | ( | x | − | 1 | ÷ | 3 | ) | − | 18 | × | 1 | ÷ | 3 | × | ( | x | − | 1 | ÷ | 3 | ) |
| = | 18 | x | ( | x | − | 1 | ÷ | 3 | ) | − | 6 | ( | x | − | 1 | ÷ | 3 | ) |
| = | 18 | x | x | − | 18 | x | × | 1 | ÷ | 3 | − | 6 | ( | x | − | 1 | ÷ | 3 | ) |
| = | 18 | x | x | − | 6 | x | − | 6 | ( | x | − | 1 | ÷ | 3 | ) |
| = | 18 | x | x | − | 6 | x | − | 6 | x | + | 6 | × | 1 | ÷ | 3 |
| = | 18 | x | x | − | 6 | x | − | 6 | x | + | 2 |
| = | 18 | x | x | − | 12 | x | + | 2 |
1 2 | x | = | 18 | x | x | − | 12 | x | + | 2 |
| x1= | 1 4 |
| x2= | 4 9 |