| X | − | 1 | ( | ( | X | − | 2 | ) | ( | X | − | 5 | ) | − | 2 | ( | X | − | 8 | ) | ) | = | - | 2 | ( | X | − | 8 | ) | − | 3 | ( | X | − | 1 | ) |
| 方程左边 = | X | − | 1 | ( | X | − | 2 | ) | ( | X | − | 5 | ) | + | 1 | × | 2 | ( | X | − | 8 | ) |
| = | X | − | 1 | ( | X | − | 2 | ) | ( | X | − | 5 | ) | + | 2 | ( | X | − | 8 | ) |
| = | X | − | 1 | X | ( | X | − | 5 | ) | + | 1 | × | 2 | ( | X | − | 5 | ) | + | 2 | ( | X | − | 8 | ) |
| = | X | − | 1 | X | ( | X | − | 5 | ) | + | 2 | ( | X | − | 5 | ) | + | 2 | ( | X | − | 8 | ) |
| = | X | − | 1 | X | X | + | 1 | X | × | 5 | + | 2 | ( | X | − | 5 | ) | + | 2 | ( | X | − | 8 | ) |
| = | X | − | 1 | X | X | + | 5 | X | + | 2 | ( | X | − | 5 | ) | + | 2 | ( | X | − | 8 | ) |
| = | 6 | X | − | 1 | X | X | + | 2 | ( | X | − | 5 | ) | + | 2 | ( | X | − | 8 | ) |
| = | 6 | X | − | 1 | X | X | + | 2 | X | − | 2 | × | 5 | + | 2 | ( | X | − | 8 | ) |
| = | 6 | X | − | 1 | X | X | + | 2 | X | − | 10 | + | 2 | ( | X | − | 8 | ) |
| = | 8 | X | − | 1 | X | X | − | 10 | + | 2 | ( | X | − | 8 | ) |
| = | 8 | X | − | 1 | X | X | − | 10 | + | 2 | X | − | 2 | × | 8 |
| = | 8 | X | − | 1 | X | X | − | 10 | + | 2 | X | − | 16 |
| = | 10 | X | − | 1 | X | X | − | 26 |
| 10 | X | − | 1 | X | X | − | 26 | = | - | 2 | ( | X | − | 8 | ) | − | 3 | ( | X | − | 1 | ) |
| 方程右边 = | - | 2 | X | + | 2 | × | 8 | − | 3 | ( | X | − | 1 | ) |
| = | - | 2 | X | + | 16 | − | 3 | ( | X | − | 1 | ) |
| = | - | 2 | X | + | 16 | − | 3 | X | + | 3 | × | 1 |
| = | - | 2 | X | + | 16 | − | 3 | X | + | 3 |
| = | - | 5 | X | + | 19 |
| 10 | X | − | 1 | X | X | − | 26 | = | - | 5 | X | + | 19 |