| - | 2 | k | + | 6 | = | ( | 2 | k | − | 6 | ) | ( | 4 | k | − | 6 | ) | × | 4 | k | − | 6 |
| 方程右边 = | 2 | k | ( | 4 | k | − | 6 | ) | × | 4 | k | − | 6 | ( | 4 | k | − | 6 | ) | × | 4 | k | − | 6 |
| = | 8 | k | ( | 4 | k | − | 6 | ) | k | − | 24 | ( | 4 | k | − | 6 | ) | k | − | 6 |
| = | 8 | k | × | 4 | k | k | − | 8 | k | × | 6 | k | − | 24 | ( | 4 | k | − | 6 | ) | k |
| = | 32 | k | k | k | − | 48 | k | k | − | 24 | ( | 4 | k | − | 6 | ) | k | − | 6 |
| = | 32 | k | k | k | − | 48 | k | k | − | 24 | × | 4 | k | k | + | 24 |
| = | 32 | k | k | k | − | 48 | k | k | − | 96 | k | k | + | 144 | k |
| - | 2 | k | + | 6 | = | 32 | k | k | k | − | 48 | k | k | − | 96 | k | k | + | 144 | k |