| 100000 | − | ( | 100000 | − | x | ) | × | 3 50 | − | x | = | 100000 | × | 1 25 |
| 方程左边 = | 100000 | − | 100000 | × | 3 50 | + | x | × | 3 50 | − | x |
| = | 100000 | − | 6000 | + | x | × | 3 50 | − | x |
| = | 94000 | − | 47 50 | x |
| 94000 | − | 47 50 | x | = | 100000 | × | 1 25 |
| 方程右边 = | 4000 |
| 94000 | − | 47 50 | x | = | 4000 |
| - | 47 50 | x | = | 4000 | − | 94000 |
| - | 47 50 | x | = | - | 90000 |
| 90000 | = | 47 50 | x |
47 50 | x | = | 90000 |
| x | = | 90000 | ÷ | 47 50 |
| = | 90000 | × | 50 47 |
| x | = | 4500000 47 |
| x | = | 95744.680851 |