| ( | 51 | X | ) | ÷ | ( | 51 | + | X | ) | = | 3 5 |
| Multiply both sides of the equation by: | ( | 51 | + | X | ) |
| ( | 51 | X | ) | = | 3 5 | ( | 51 | + | X | ) |
| 51 | X | = | 3 5 | ( | 51 | + | X | ) |
| 51 | X | = | 3 5 | × | 51 | + | 3 5 | X |
| 51 | X | = | 153 5 | + | 3 5 | X |
| 51 | X | − | 3 5 | X | = | 153 5 |
252 5 | X | = | 153 5 |
| X | = | 153 5 | ÷ | 252 5 |
| = | 153 5 | × | 5 252 |
| = | 17 | × | 1 28 |
| X | = | 17 28 |
| X | = | 0.607143 |