| ( | X | − | 135 | ) | ÷ | 610 | = | ( | X | − | 435 2 | ) | ÷ | 410 |
| 方程左边 = | X | × | 1 610 | − | 135 | × | 1 610 |
| = | X | × | 1 610 | − | 27 122 |
1 610 | X | − | 27 122 | = | ( | X | − | 435 2 | ) | ÷ | 410 |
| 方程右边 = | X | × | 1 410 | − | 435 2 | × | 1 410 |
| = | X | × | 1 410 | − | 87 164 |
1 610 | X | − | 27 122 | = | 1 410 | X | − | 87 164 |
1 610 | X | − | 1 410 | X | = | - | 87 164 | + | 27 122 |
| - | 2 2501 | X | = | - | 87 164 | + | 27 122 |
| - | 2 2501 | X | = | - | 3093 10004 |
3093 10004 | = | 2 2501 | X |
2 2501 | X | = | 3093 10004 |
| X | = | 3093 10004 | ÷ | 2 2501 |
| = | 3093 10004 | × | 2501 2 |
| = | 3093 4 | × | 1 2 |
| X | = | 3093 8 |
| X | = | 386.625 |