| ( | 500 | ( | 1 | − | 1 25 | ) | − | x | ) | ( | 60 | + | 2 | × | 4 | ) | = | ( | 500 | − | x | ) | × | 60 |
| 方程左边 = | 500 | ( | 1 | − | 1 25 | ) | ( | 60 | + | 2 | × | 4 | ) | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 500 | × | 1 | ( | 60 | + | 2 | × | 4 | ) | − | 500 | × | 1 25 | ( | 60 | + | 2 | × | 4 | ) | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 500 | ( | 60 | + | 2 | × | 4 | ) | − | 20 | ( | 60 | + | 2 | × | 4 | ) | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 500 | × | 60 | + | 500 | × | 2 | × | 4 | − | 20 | ( | 60 | + | 2 | × | 4 | ) | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 30000 | + | 4000 | − | 20 | ( | 60 | + | 2 | × | 4 | ) | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 34000 | − | 20 | ( | 60 | + | 2 | × | 4 | ) | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 34000 | − | 20 | × | 60 | − | 20 | × | 2 | × | 4 | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 34000 | − | 1200 | − | 160 | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 32640 | − | x | ( | 60 | + | 2 | × | 4 | ) |
| = | 32640 | − | x | × | 60 | − | x | × | 2 | × | 4 |
| = | 32640 | − | x | × | 60 | − | x | × | 8 |
| = | 32640 | − | 68 | x |
| 32640 | − | 68 | x | = | ( | 500 | − | x | ) | × | 60 |
| 方程右边 = | 500 | × | 60 | − | x | × | 60 |
| = | 30000 | − | x | × | 60 |
| 32640 | − | 68 | x | = | 30000 | − | 60 | x |
| - | 68 | x | + | 60 | x | = | 30000 | − | 32640 |
| - | 8 | x | = | 30000 | − | 32640 |
| - | 8 | x | = | - | 2640 |
| 2640 | = | 8 | x |
| 8 | x | = | 2640 |
| x | = | 2640 | ÷ | 8 |
| = | 2640 | × | 1 8 |
| = | 330 | × | 1 |
| x | = | 330 |