| 600 | ÷ | x | − | 600 | ÷ | ( | x | + | 100 | ) | = | 1 5 |
| Multiply both sides of the equation by: | x |
| 600 | − | 600 | ÷ | ( | x | + | 100 | ) | × | x | = | 1 5 | x |
| Multiply both sides of the equation by: | ( | x | + | 100 | ) |
| 600 | ( | x | + | 100 | ) | − | 600 | x | = | 1 5 | x | ( | x | + | 100 | ) |
| 600 | x | + | 600 | × | 100 | − | 600 | x | = | 1 5 | x | ( | x | + | 100 | ) |
| 600 | x | + | 600 | × | 100 | − | 600 | x | = | 1 5 | x | x | + | 1 5 | x | × | 100 |
| 600 | x | + | 60000 | − | 600 | x | = | 1 5 | x | x | + | 20 | x |
| 0 | x | + | 60000 | = | 1 5 | x | x | + | 20 | x |