| ( | 18 | − | 6 | x | ) | ( | 3 2 | − | 1 2 | x | ) | = | ( | 18 | + | 6 | x | ) | ( | 3 2 | + | 1 2 | x | ) | − | ( | 18 | + | 6 | x | ) |
| 方程左边 = | 18 | ( | 3 2 | − | 1 2 | x | ) | − | 6 | x | ( | 3 2 | − | 1 2 | x | ) |
| = | 18 | × | 3 2 | − | 18 | × | 1 2 | x | − | 6 | x | ( | 3 2 | − | 1 2 | x | ) |
| = | 27 | − | 9 | x | − | 6 | x | ( | 3 2 | − | 1 2 | x | ) |
| = | 27 | − | 9 | x | − | 6 | x | × | 3 2 | + | 6 | x | × | 1 2 | x |
| = | 27 | − | 9 | x | − | 9 | x | + | 3 | x | x |
| = | 27 | − | 18 | x | + | 3 | x | x |
| 27 | − | 18 | x | + | 3 | x | x | = | ( | 18 | + | 6 | x | ) | ( | 3 2 | + | 1 2 | x | ) | − | ( | 18 | + | 6 | x | ) |
| 方程右边 = | 18 | ( | 3 2 | + | 1 2 | x | ) | + | 6 | x | ( | 3 2 | + | 1 2 | x | ) | − | ( | 18 | + | 6 | x | ) |
| = | 18 | × | 3 2 | + | 18 | × | 1 2 | x | + | 6 | x | ( | 3 2 | + | 1 2 | x | ) | − | ( | 18 | + | 6 | x | ) |
| = | 27 | + | 9 | x | + | 6 | x | ( | 3 2 | + | 1 2 | x | ) | − | ( | 18 | + | 6 | x | ) |
| = | 27 | + | 9 | x | + | 6 | x | × | 3 2 | + | 6 | x | × | 1 2 | x | − | ( | 18 | + | 6 | x | ) |
| = | 27 | + | 9 | x | + | 9 | x | + | 3 | x | x | − | ( | 18 | + | 6 | x | ) |
| = | 27 | + | 18 | x | + | 3 | x | x | − | ( | 18 | + | 6 | x | ) |
| = | 27 | + | 18 | x | + | 3 | x | x | − | 18 | − | 6 | x |
| = | 9 | + | 12 | x | + | 3 | x | x |
| 27 | − | 18 | x | + | 3 | x | x | = | 9 | + | 12 | x | + | 3 | x | x |
| x= | 3 5 |