| 48 | = | X | ÷ | ( | 100 | + | X | ) | × | 100 100 |
| Multiply both sides of the equation by: | ( | 100 | + | X | ) |
| 48 | ( | 100 | + | X | ) | = | X | × | 100 100 |
| 48 | × | 100 | + | 48 | X | = | X | × | 100 100 |
| 4800 | + | 48 | X | = | X | × | 100 100 |
| 48 | X | − | 100 100 | X | = | - | 4800 |
| 47 | X | = | - | 4800 |
| X | = | - | 4800 | ÷ | 47 |
| = | - | 4800 | × | 1 47 |
| X | = | - | 4800 47 |
| X | = | - 102.12766 |