| ( | 10000 | − | X | ) | ÷ | X | = | - | 70 100 |
| Multiply both sides of the equation by: | X |
| ( | 10000 | − | X | ) | = | - | 70 100 | X |
| 10000 | − | X | = | - | 70 100 | X |
| - | X | + | 70 100 | X | = | - | 10000 |
| - | 3 10 | X | = | - | 10000 |
| 10000 | = | 3 10 | X |
3 10 | X | = | 10000 |
| X | = | 10000 | ÷ | 3 10 |
| = | 10000 | × | 10 3 |
| X | = | 100000 3 |
| X | = | 33333.333333 |