| 10000 | ÷ | x | − | 10000 | ÷ | ( | x | + | 40 | ) | = | 0 |
| Multiply both sides of the equation by: | x |
| 10000 | − | 10000 | ÷ | ( | x | + | 40 | ) | × | x | = | 0 |
| Multiply both sides of the equation by: | ( | x | + | 40 | ) |
| 10000 | ( | x | + | 40 | ) | − | 10000 | x | = | 0 |
| 10000 | x | + | 10000 | × | 40 | − | 10000 | x | = | 0 |
| 10000 | x | + | 400000 | − | 10000 | x | = | 0 |
| 0 | x | + | 400000 | = | 0 |
| = | 0 | − | 400000 |