| ( | 17390 | − | X | ) | ÷ | X | = | 11 20 |
| Multiply both sides of the equation by: | X |
| ( | 17390 | − | X | ) | = | 11 20 | X |
| 17390 | − | X | = | 11 20 | X |
| - | X | − | 11 20 | X | = | - | 17390 |
| - | 31 20 | X | = | - | 17390 |
| 17390 | = | 31 20 | X |
31 20 | X | = | 17390 |
| X | = | 17390 | ÷ | 31 20 |
| = | 17390 | × | 20 31 |
| X | = | 347800 31 |
| X | = | 11219.354839 |