| ( | 3834 5 | − | X | ) | ÷ | 3834 5 | × | 100 | = | 3 10 |
| 方程左边 = | ( | 3834 5 | − | X | ) | × | 250 1917 |
| ( | 3834 5 | − | X | ) | × | 250 1917 | = | 3 10 |
| 方程左边 = | 3834 5 | × | 250 1917 | − | X | × | 250 1917 |
| = | 100 | − | X | × | 250 1917 |
| 100 | − | 250 1917 | X | = | 3 10 |
| - | 250 1917 | X | = | 3 10 | − | 100 |
| - | 250 1917 | X | = | - | 997 10 |
997 10 | = | 250 1917 | X |
250 1917 | X | = | 997 10 |
| X | = | 997 10 | ÷ | 250 1917 |
| = | 997 10 | × | 1917 250 |
| X | = | 1911249 2500 |
| X | = | 764.4996 |