| ( | x | − | 3 | ) | ( | x | − | 3 | ) | ( | x | − | 6 | ) | + | 32 | + | 84 | + | 36 | − | 24 | x | = | 0 |
| 方程左边 = | ( | x | − | 3 | ) | ( | x | − | 3 | ) | ( | x | − | 6 | ) | + | 152 | − | 24 | x |
| ( | x | − | 3 | ) | ( | x | − | 3 | ) | ( | x | − | 6 | ) | + | 152 | − | 24 | x | = | 0 |
| 方程左边 = | x | ( | x | − | 3 | ) | ( | x | − | 6 | ) | − | 3 | ( | x | − | 3 | ) | ( | x | − | 6 | ) | + | 152 | − | 24 | x |
| = | x | x | ( | x | − | 6 | ) | − | x | × | 3 | ( | x | − | 6 | ) | − | 3 | ( | x | − | 3 | ) | ( | x | − | 6 | ) | + | 152 | − | 24 | x |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | ( | x | − | 6 | ) | − | 3 | ( | x | − | 3 | ) | ( | x | − | 6 | ) |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | x | × | 3 | × | 6 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | x | × | 18 | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | − | 6 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | − | 6 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | − | 6 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | − | 6 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | − | 6 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | 12 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | 12 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | 12 | x | − | 3 |
| = | x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | 21 | x | − | 3 |
| x | x | x | − | x | x | × | 6 | − | x | × | 3 | x | + | 21 | x | − | 3 | = | 0 |