| 500 | ÷ | ( | 60 | − | x | ) | = | 1000 | ÷ | ( | 100 | − | x | ) |
| 方程两边同时乘以: | ( | 60 | − | x | ) | , | ( | 100 | − | x | ) |
| 500 | ( | 100 | − | x | ) | = | 1000 | ( | 60 | − | x | ) |
| 500 | × | 100 | − | 500 | x | = | 1000 | ( | 60 | − | x | ) |
| 500 | × | 100 | − | 500 | x | = | 1000 | × | 60 | − | 1000 | x |
| 50000 | − | 500 | x | = | 60000 | − | 1000 | x |
| - | 500 | x | + | 1000 | x | = | 60000 | − | 50000 |
| 500 | x | = | 60000 | − | 50000 |
| 500 | x | = | 10000 |
| x | = | 10000 | ÷ | 500 |
| = | 10000 | × | 1 500 |
| = | 20 | × | 1 |
| x | = | 20 |