| ( | 6000000 | − | 4 | X | ) | ÷ | X | ÷ | 90 | = | 0 |
| Multiply both sides of the equation by: | X |
| ( | 6000000 | − | 4 | X | ) | ÷ | 90 | = | 0 |
| 6000000 | ÷ | 90 | − | 4 | X | ÷ | 90 | = | 0 |
200000 3 | − | 2 45 | X | = | 0 |
| - | 2 45 | X | = | 0 | − | 200000 3 |
| - | 2 45 | X | = | - | 200000 3 |
200000 3 | = | 2 45 | X |
2 45 | X | = | 200000 3 |
| X | = | 200000 3 | ÷ | 2 45 |
| = | 200000 3 | × | 45 2 |
| = | 100000 | × | 15 |
| X | = | 1500000 |