9 20 | − | ( | 1 | + | X | ) | ÷ | X | × | 5 100 | = | 0 |
| Multiply both sides of the equation by: | X |
9 20 | X | − | ( | 1 | + | X | ) | × | 5 100 | = | 0 |
9 20 | X | − | 1 | × | 5 100 | − | X | × | 5 100 | = | 0 |
9 20 | X | − | 1 20 | − | X | × | 5 100 | = | 0 |
2 5 | X | − | 1 20 | = | 0 |
2 5 | X | = | 0 | + | 1 20 |
2 5 | X | = | 1 20 |
| X | = | 1 20 | ÷ | 2 5 |
| = | 1 20 | × | 5 2 |
| = | 1 4 | × | 1 2 |
| X | = | 1 8 |
| X | = | 0.125 |