| 1 | ÷ | ( | 1 2 | × | 1 5 | × | 2 | X | ) | = | 19 20 |
| Multiply both sides of the equation by: | ( | 1 2 | × | 1 5 | × | 2 | X | ) |
| 1 | = | 19 20 | ( | 1 2 | × | 1 5 | × | 2 | X | ) |
| 1 | = | 19 20 | × | 1 2 | × | 1 5 | × | 2 | X |
| 1 | = | 19 100 | X |
| - | 19 100 | X | = | - | 1 |
| 1 | = | 19 100 | X |
19 100 | X | = | 1 |
| X | = | 1 | ÷ | 19 100 |
| = | 1 | × | 100 19 |
| X | = | 100 19 |
| X | = | 5.263158 |