| ( | 1800 | − | X | ) | ÷ | X | = | - | 14 100 |
| Multiply both sides of the equation by: | X |
| ( | 1800 | − | X | ) | = | - | 14 100 | X |
| 1800 | − | X | = | - | 14 100 | X |
| - | X | + | 14 100 | X | = | - | 1800 |
| - | 43 50 | X | = | - | 1800 |
| 1800 | = | 43 50 | X |
43 50 | X | = | 1800 |
| X | = | 1800 | ÷ | 43 50 |
| = | 1800 | × | 50 43 |
| X | = | 90000 43 |
| X | = | 2093.023256 |