| 451 | X | − | 451 | × | 1439 1000 | = | 315 | × | 717 500 | − | 315 | X |
| 方程左边 = | 451 | X | − | 648989 1000 |
| 451 | X | − | 648989 1000 | = | 315 | × | 717 500 | − | 315 | X |
| 方程右边 = | 45171 100 | − | 315 | X |
| 451 | X | − | 648989 1000 | = | 45171 100 | − | 315 | X |
| 451 | X | + | 315 | X | = | 45171 100 | + | 648989 1000 |
| 766 | X | = | 45171 100 | + | 648989 1000 |
| 766 | X | = | 1100699 1000 |
| X | = | 1100699 1000 | ÷ | 766 |
| = | 1100699 1000 | × | 1 766 |
| X | = | 1100699 766000 |
| X | = | 1.436944 |