| 6 | ( | 2 | − | X | ) | + | ( | X | − | 2 | ) | ( | 2 | − | X | ) | = | ( | X | − | 14 | ) | ( | X | − | 2 | ) |
| 方程左边 = | 6 | × | 2 | − | 6 | X | + | ( | X | − | 2 | ) | ( | 2 | − | X | ) |
| = | 12 | − | 6 | X | + | ( | X | − | 2 | ) | ( | 2 | − | X | ) |
| = | 12 | − | 6 | X | + | X | ( | 2 | − | X | ) | − | 2 | ( | 2 | − | X | ) |
| = | 12 | − | 6 | X | + | X | × | 2 | − | X | X | − | 2 | ( | 2 | − | X | ) |
| = | 12 | − | 4 | X | − | X | X | − | 2 | ( | 2 | − | X | ) |
| = | 12 | − | 4 | X | − | X | X | − | 2 | × | 2 | + | 2 | X |
| = | 12 | − | 4 | X | − | X | X | − | 4 | + | 2 | X |
| = | 8 | − | 2 | X | − | X | X |
| 8 | − | 2 | X | − | X | X | = | ( | X | − | 14 | ) | ( | X | − | 2 | ) |
| 方程右边 = | X | ( | X | − | 2 | ) | − | 14 | ( | X | − | 2 | ) |
| = | X | X | − | X | × | 2 | − | 14 | ( | X | − | 2 | ) |
| = | X | X | − | 2 | X | − | 14 | X | + | 14 | × | 2 |
| = | X | X | − | 2 | X | − | 14 | X | + | 28 |
| = | X | X | − | 16 | X | + | 28 |
| 8 | − | 2 | X | − | X | X | = | X | X | − | 16 | X | + | 28 |