| ( | 5 | − | x | ) | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 6 | + | 6 | − | 6 | x | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) | ( | - | 1 | − | x | ) | = | 0 |
| 方程左边 = | ( | 5 | − | x | ) | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 6 | x | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) | ( | - | 1 | − | x | ) |
| ( | 5 | − | x | ) | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 6 | x | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) | ( | - | 1 | − | x | ) | = | 0 |
| 方程左边 = | 5 | ( | - | x | ) | ( | - | 1 | − | x | ) | − | x | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 6 | x | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) |
| = | - | 5 | x | ( | - | 1 | − | x | ) | − | x | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 6 | x | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) |
| = | 5 | x | × | 1 | + | 5 | x | x | − | x | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 6 | x |
| = | 5 | x | + | 5 | x | x | − | x | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 6 | x | − | 2 |
| = | - | 1 | x | + | 5 | x | x | − | x | ( | - | x | ) | ( | - | 1 | − | x | ) | + | 12 | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) |
| = | - | 1 | x | + | 5 | x | x | + | x | x | ( | - | 1 | − | x | ) | + | 12 | − | 2 | ( | 5 | − | x | ) | − | ( | - | 6 | ) |
| = | - | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 12 |
| = | - | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 12 |
| = | - | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 12 |
| = | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 2 |
| = | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 2 |
| = | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 2 |
| = | 1 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | + | 2 |
| = | - | 5 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | − | 4 |
| - | 5 | x | + | 5 | x | x | − | x | x | × | 1 | − | x | x | x | − | 4 | = | 0 |