| ( | 7 50 | − | x | ) | ÷ | 1 25 | = | ( | 150 | − | x | ) | ÷ | 50 |
| 方程左边 = | 7 50 | × | 25 | − | x | × | 25 |
| = | 7 2 | − | x | × | 25 |
7 2 | − | 25 | x | = | ( | 150 | − | x | ) | ÷ | 50 |
| 方程右边 = | 150 | × | 1 50 | − | x | × | 1 50 |
| = | 3 | − | x | × | 1 50 |
7 2 | − | 25 | x | = | 3 | − | 1 50 | x |
| - | 25 | x | + | 1 50 | x | = | 3 | − | 7 2 |
| - | 1249 50 | x | = | 3 | − | 7 2 |
| - | 1249 50 | x | = | - | 1 2 |
1 2 | = | 1249 50 | x |
1249 50 | x | = | 1 2 |
| x | = | 1 2 | ÷ | 1249 50 |
| = | 1 2 | × | 50 1249 |
| = | 1 | × | 25 1249 |
| x | = | 25 1249 |
| x | = | 0.020016 |