| ( | 30 | X | − | 30 | X | X | X | X | X | X | ) | ÷ | ( | 1 | − | X | ) | = | 1542720 |
| Multiply both sides of the equation by: | ( | 1 | − | X | ) |
| ( | 30 | X | − | 30 | X | X | X | X | X | X | ) | = | 1542720 | ( | 1 | − | X | ) |
| 30 | X | − | 30 | X | X | X | X | X | X | = | 1542720 | ( | 1 | − | X | ) |
| 30 | X | − | 30 | X | X | X | X | X | X | = | 1542720 | × | 1 | − | 1542720 | X |
| 30 | X | − | 30 | X | X | X | X | X | X | = | 1542720 | − | 1542720 | X |