| ( | 1 20 | + | 1 20 | X | ) | ÷ | X | = | 13 25 |
| Multiply both sides of the equation by: | X |
| ( | 1 20 | + | 1 20 | X | ) | = | 13 25 | X |
1 20 | + | 1 20 | X | = | 13 25 | X |
1 20 | X | − | 13 25 | X | = | - | 1 20 |
| - | 47 100 | X | = | - | 1 20 |
1 20 | = | 47 100 | X |
47 100 | X | = | 1 20 |
| X | = | 1 20 | ÷ | 47 100 |
| = | 1 20 | × | 100 47 |
| = | 1 | × | 5 47 |
| X | = | 5 47 |
| X | = | 0.106383 |