| ( | 60 | − | x | ) | ( | 92 | − | 2 | x | ) | = | 885 | × | 6 |
| 方程左边 = | 60 | ( | 92 | − | 2 | x | ) | − | x | ( | 92 | − | 2 | x | ) |
| = | 60 | × | 92 | − | 60 | × | 2 | x | − | x | ( | 92 | − | 2 | x | ) |
| = | 5520 | − | 120 | x | − | x | ( | 92 | − | 2 | x | ) |
| = | 5520 | − | 120 | x | − | x | × | 92 | + | x | × | 2 | x |
| = | 5520 | − | 212 | x | + | x | × | 2 | x |
| 5520 | − | 212 | x | + | x | × | 2 | x | = | 885 | × | 6 |
| 方程右边 = | 5310 |
| 5520 | − | 212 | x | + | x | × | 2 | x | = | 5310 |