| ( | 160 | + | x | − | 20 | ) | ( | 60 | − | x | ÷ | 10 | ) | = | 10080 |
| 方程左边 = | 160 | ( | 60 | − | x | ÷ | 10 | ) | + | x | ( | 60 | − | x | ÷ | 10 | ) | − | 20 | ( | 60 | − | x | ÷ | 10 | ) |
| = | 160 | × | 60 | − | 160 | x | ÷ | 10 | + | x | ( | 60 | − | x | ÷ | 10 | ) | − | 20 | ( | 60 | − | x | ÷ | 10 | ) |
| = | 9600 | − | 16 | x | + | x | ( | 60 | − | x | ÷ | 10 | ) | − | 20 | ( | 60 | − | x | ÷ | 10 | ) |
| = | 9600 | − | 16 | x | + | x | × | 60 | − | x | x | ÷ | 10 | − | 20 | ( | 60 | − | x | ÷ | 10 | ) |
| = | 9600 | + | 44 | x | − | x | x | × | 1 10 | − | 20 | ( | 60 | − | x | ÷ | 10 | ) |
| = | 9600 | + | 44 | x | − | x | x | × | 1 10 | − | 20 | × | 60 | + | 20 | x | ÷ | 10 |
| = | 9600 | + | 44 | x | − | x | x | × | 1 10 | − | 1200 | + | 2 | x |
| = | 8400 | + | 46 | x | − | x | x | × | 1 10 |
| 8400 | + | 46 | x | − | x | x | × | 1 10 | = | 10080 |