| ( | 6 | − | 2 | x | ) | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) | = | 0 |
| 方程左边 = | 6 | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | 6 | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | × | 6 | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | 6 | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 36 | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 6 | × | 2 | ( | 3 | − | x | ) | − | 6 | x | ( | 3 | − | x | ) | + | 36 | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 12 | ( | 3 | − | x | ) | − | 6 | x | ( | 3 | − | x | ) | + | 36 | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 12 | × | 3 | + | 12 | x | − | 6 | x | ( | 3 | − | x | ) | + | 36 | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 36 | + | 12 | x | − | 6 | x | ( | 3 | − | x | ) | + | 36 | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 0 | + | 12 | x | − | 6 | x | ( | 3 | − | x | ) | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | 12 | x | − | 6 | x | × | 3 | + | 6 | x | x | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | 12 | x | − | 18 | x | + | 6 | x | x | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 6 | x | + | 6 | x | x | − | 2 | x | ( | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | + | 6 | ) |
| = | - | 6 | x | + | 6 | x | x | − | 2 | x | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | − | 2 | x | × | 6 |
| = | - | 6 | x | + | 6 | x | x | − | 2 | x | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) | − | 12 | x |
| = | - | 18 | x | + | 6 | x | x | − | 2 | x | ( | - | 2 | − | x | ) | ( | 3 | − | x | ) |
| = | - | 18 | x | + | 6 | x | x | + | 2 | x | × | 2 | ( | 3 | − | x | ) | + | 2 | x | x |
| = | - | 18 | x | + | 6 | x | x | + | 4 | x | ( | 3 | − | x | ) | + | 2 | x | x | ( | 3 | − | x | ) |
| = | - | 18 | x | + | 6 | x | x | + | 4 | x | × | 3 | − | 4 | x | x | + | 2 |
| = | - | 18 | x | + | 6 | x | x | + | 12 | x | − | 4 | x | x | + | 2 | x |
| = | - | 6 | x | + | 6 | x | x | − | 4 | x | x | + | 2 | x | x | ( | 3 | − | x | ) |
| = | - | 6 | x | + | 6 | x | x | − | 4 | x | x | + | 2 | x | x | × | 3 |
| = | - | 6 | x | + | 6 | x | x | − | 4 | x | x | + | 6 | x | x | − | 2 |
| - | 6 | x | + | 6 | x | x | − | 4 | x | x | + | 6 | x | x | − | 2 | = | 0 |