| 55 | X | ÷ | ( | 100 | + | X | ) | = | 61 25 |
| Multiply both sides of the equation by: | ( | 100 | + | X | ) |
| 55 | X | = | 61 25 | ( | 100 | + | X | ) |
| 55 | X | = | 61 25 | × | 100 | + | 61 25 | X |
| 55 | X | = | 244 | + | 61 25 | X |
| 55 | X | − | 61 25 | X | = | 244 |
1314 25 | X | = | 244 |
| X | = | 244 | ÷ | 1314 25 |
| = | 244 | × | 25 1314 |
| = | 122 | × | 25 657 |
| X | = | 3050 657 |
| X | = | 4.642314 |