| ( | 11 | x | − | 60 | ) | ( | 11 | x | − | 6 | ) | = | 1008 |
| 方程左边 = | 11 | x | ( | 11 | x | − | 6 | ) | − | 60 | ( | 11 | x | − | 6 | ) |
| = | 11 | x | × | 11 | x | − | 11 | x | × | 6 | − | 60 | ( | 11 | x | − | 6 | ) |
| = | 121 | x | x | − | 66 | x | − | 60 | ( | 11 | x | − | 6 | ) |
| = | 121 | x | x | − | 66 | x | − | 60 | × | 11 | x | + | 60 | × | 6 |
| = | 121 | x | x | − | 66 | x | − | 660 | x | + | 360 |
| = | 121 | x | x | − | 726 | x | + | 360 |
| 121 | x | x | − | 726 | x | + | 360 | = | 1008 |