| ( | 60 | − | x | ÷ | 3 | × | 5 | ) | ( | 100 | + | x | ) | = | 4480 |
| 方程左边 = | 60 | ( | 100 | + | x | ) | − | x | ÷ | 3 | × | 5 | ( | 100 | + | x | ) |
| = | 60 | ( | 100 | + | x | ) | − | x | × | 5 3 | ( | 100 | + | x | ) |
| = | 60 | × | 100 | + | 60 | x | − | x | × | 5 3 | ( | 100 | + | x | ) |
| = | 6000 | + | 60 | x | − | x | × | 5 3 | ( | 100 | + | x | ) |
| = | 6000 | + | 60 | x | − | x | × | 5 3 | × | 100 | − | x | × | 5 3 | x |
| = | 6000 | + | 60 | x | − | x | × | 500 3 | − | x | × | 5 3 | x |
| = | 6000 | − | 320 3 | x | − | x | × | 5 3 | x |
| 6000 | − | 320 3 | x | − | x | × | 5 3 | x | = | 4480 |