| 1 | ÷ | X | + | 1 | ÷ | X | + | 2 | + | 1 | ÷ | X | + | 4 | = | 0 |
| Multiply both sides of the equation by: | X |
| 1 | + | 1 | ÷ | 1 | × | 1 | + | 2 | X | + | 1 | ÷ | 1 | × | 1 | + | 4 | X | = | 0 |
| 2 | X | + | 4 | X | = | 0 | − | 1 | − | 1 | ÷ | 1 | × | 1 | − | 1 | ÷ | 1 | × | 1 |
| 2 | X | + | 4 | X | = | 0 | − | 1 | − | 1 | − | 1 |
| 6 | X | = | 0 | − | 1 | − | 1 | − | 1 |
| 6 | X | = | - | 3 |
| X | = | - | 3 | ÷ | 6 |
| = | - | 3 | × | 1 6 |
| = | - | 1 | × | 1 2 |
| X | = | - | 1 2 |
| X | = | - 0.5 |