| ( | X | − | 1100 | × | 7200 | ) | ÷ | X | = | 1969 5000 |
| Multiply both sides of the equation by: | X |
| ( | X | − | 1100 | × | 7200 | ) | = | 1969 5000 | X |
| X | − | 1100 | × | 7200 | = | 1969 5000 | X |
| X | − | 7920000 | = | 1969 5000 | X |
| X | − | 1969 5000 | X | = | 7920000 |
3031 5000 | X | = | 7920000 |
| X | = | 7920000 | ÷ | 3031 5000 |
| = | 7920000 | × | 5000 3031 |
| X | = | 39600000000 3031 |