| ( | 407 | − | X | ) | ÷ | X | = | - | 67 250 |
| Multiply both sides of the equation by: | X |
| ( | 407 | − | X | ) | = | - | 67 250 | X |
| 407 | − | X | = | - | 67 250 | X |
| - | X | + | 67 250 | X | = | - | 407 |
| - | 183 250 | X | = | - | 407 |
| 407 | = | 183 250 | X |
183 250 | X | = | 407 |
| X | = | 407 | ÷ | 183 250 |
| = | 407 | × | 250 183 |
| X | = | 101750 183 |
| X | = | 556.010929 |