| ( | 2200 | − | x | ) | ÷ | x | = | - | 77 100 |
| Multiply both sides of the equation by: | x |
| ( | 2200 | − | x | ) | = | - | 77 100 | x |
| 2200 | − | x | = | - | 77 100 | x |
| - | x | + | 77 100 | x | = | - | 2200 |
| - | 23 100 | x | = | - | 2200 |
| 2200 | = | 23 100 | x |
23 100 | x | = | 2200 |
| x | = | 2200 | ÷ | 23 100 |
| = | 2200 | × | 100 23 |
| x | = | 220000 23 |
| x | = | 9565.217391 |