| 1 | ÷ | X | + | 1 | ÷ | X | + | 15 | = | 1 | ÷ | 4 |
| Multiply both sides of the equation by: | X |
| 1 | + | 1 | ÷ | 1 | × | 1 | + | 15 | X | = | 1 | ÷ | 4 | × | X |
| 15 | X | − | 1 | ÷ | 4 | × | X | = | - | 1 | − | 1 | ÷ | 1 | × | 1 |
| 15 | X | − | 1 4 | X | = | - | 1 | − | 1 | ÷ | 1 | × | 1 |
| 15 | X | − | 1 4 | X | = | - | 1 | − | 1 |
59 4 | X | = | - | 1 | − | 1 |
59 4 | X | = | - | 2 |
| X | = | - | 2 | ÷ | 59 4 |
| = | - | 2 | × | 4 59 |
| X | = | - | 8 59 |
| X | = | - 0.135593 |