| 102 | X | + | 6679 50 | ( | 100 | − | X | ) | = | 11500 |
| 方程左边 = | 102 | X | + | 6679 50 | × | 100 | − | 6679 50 | X |
| = | 102 | X | + | 13358 | − | 6679 50 | X |
| = | - | 1579 50 | X | + | 13358 |
| - | 1579 50 | X | + | 13358 | = | 11500 |
| - | 1579 50 | X | = | 11500 | − | 13358 |
| - | 1579 50 | X | = | - | 1858 |
| 1858 | = | 1579 50 | X |
1579 50 | X | = | 1858 |
| X | = | 1858 | ÷ | 1579 50 |
| = | 1858 | × | 50 1579 |
| X | = | 92900 1579 |
| X | = | 58.834706 |