| X | × | 1 5 | − | 1410 | − | X | = | 21686589 100 |
| 方程左边 = | - | 4 5 | X | − | 1410 |
| - | 4 5 | X | − | 1410 | = | 21686589 100 |
| - | 4 5 | X | = | 21686589 100 | + | 1410 |
| - | 4 5 | X | = | 21827589 100 |
| - | 21827589 100 | = | 4 5 | X |
4 5 | X | = | - | 21827589 100 |
| X | = | - | 21827589 100 | ÷ | 4 5 |
| = | - | 21827589 100 | × | 5 4 |
| = | - | 21827589 20 | × | 1 4 |
| X | = | - | 21827589 80 |
| X | = | - 272844.8625 |