| 90723 | = | 90723 | ÷ | ( | 1 | + | x | ) | × | ( | 1 | + | x | ) |
| Multiply both sides of the equation by: | ( | 1 | + | x | ) |
| 90723 | ( | 1 | + | x | ) | = | 90723 | ( | 1 | + | x | ) |
| 90723 | × | 1 | + | 90723 | x | = | 90723 | ( | 1 | + | x | ) |
| 90723 | × | 1 | + | 90723 | x | = | 90723 | × | 1 | + | 90723 | x |
| 90723 | + | 90723 | x | = | 90723 | + | 90723 | x |
| 90723 | x | − | 90723 | x | = | 90723 | − | 90723 |
| 0 | x | = | 90723 | − | 90723 |
| 0 | x | = | 0 |