| x | ÷ | ( | x | + | 100 | ) | = | 213 100 |
| Multiply both sides of the equation by: | ( | x | + | 100 | ) |
| x | = | 213 100 | ( | x | + | 100 | ) |
| x | = | 213 100 | x | + | 213 100 | × | 100 |
| x | = | 213 100 | x | + | 213 |
| x | − | 213 100 | x | = | 213 |
| - | 113 100 | x | = | 213 |
| - | 213 | = | 113 100 | x |
113 100 | x | = | - | 213 |
| x | = | - | 213 | ÷ | 113 100 |
| = | - | 213 | × | 100 113 |
| x | = | - | 21300 113 |
| x | = | - 188.495575 |