| ( | 3 40 | − | x | ) | ÷ | 37 500 | = | 149 5 | ÷ | 199 5 |
| 方程左边 = | 3 40 | × | 500 37 | − | x | × | 500 37 |
| = | 75 74 | − | x | × | 500 37 |
75 74 | − | 500 37 | x | = | 149 5 | ÷ | 199 5 |
| 方程右边 = | 149 199 |
75 74 | − | 500 37 | x | = | 149 199 |
| - | 500 37 | x | = | 149 199 | − | 75 74 |
| - | 500 37 | x | = | - | 3899 14726 |
3899 14726 | = | 500 37 | x |
500 37 | x | = | 3899 14726 |
| x | = | 3899 14726 | ÷ | 500 37 |
| = | 3899 14726 | × | 37 500 |
| = | 3899 398 | × | 1 500 |
| x | = | 3899 199000 |
| x | = | 0.019593 |