10 100 | − | X | ÷ | 10 100 | − | 15 100 | = | 8300 | − | 0 | ÷ | 8300 | + | 3910 |
| 方程左边 = | - | 1 20 | − | 100 10 | X |
| - | 1 20 | − | 100 10 | X | = | 8300 | − | 0 | ÷ | 8300 | + | 3910 |
| 方程右边 = | 8300 | − | 0 | + | 3910 |
| = | 12210 |
| - | 1 20 | − | 100 10 | X | = | 12210 |
| - | 100 10 | X | = | 12210 | + | 1 20 |
| - | 100 10 | X | = | 244201 20 |
| - | 244201 20 | = | 100 10 | X |
100 10 | X | = | - | 244201 20 |
| X | = | - | 244201 20 | ÷ | 100 10 |
| = | - | 244201 20 | × | 10 100 |
| = | - | 244201 2 | × | 1 100 |
| X | = | - | 244201 200 |
| X | = | - 1221.005 |