| 2 | + | 3 | + | 42 5 | = | X | − | X | × | 17 100 | − | X | × | 9 500 |
| 方程左边 = | 67 5 |
67 5 | = | X | − | X | × | 17 100 | − | X | × | 9 500 |
| 方程右边 = | 203 250 | X |
67 5 | = | 203 250 | X |
| - | 203 250 | X | = | - | 67 5 |
67 5 | = | 203 250 | X |
203 250 | X | = | 67 5 |
| X | = | 67 5 | ÷ | 203 250 |
| = | 67 5 | × | 250 203 |
| = | 67 | × | 50 203 |
| X | = | 3350 203 |
| X | = | 16.502463 |