| 1 | X | ÷ | ( | 100 | + | X | ) | = | 61 25 |
| 方程两边同时乘以: | ( | 100 | + | X | ) |
| 1 | X | = | 61 25 | ( | 100 | + | X | ) |
| 1 | X | = | 61 25 | × | 100 | + | 61 25 | X |
| 1 | X | = | 244 | + | 61 25 | X |
| 1 | X | − | 61 25 | X | = | 244 |
| - | 36 25 | X | = | 244 |
| - | 244 | = | 36 25 | X |
36 25 | X | = | - | 244 |
| X | = | - | 244 | ÷ | 36 25 |
| = | - | 244 | × | 25 36 |
| = | - | 61 | × | 25 9 |
| X | = | - | 1525 9 |
| X | = | - 169.444444 |