| 300 | ÷ | ( | a | + | 150 | ) | = | ( | a | + | 600 | ) | ÷ | ( | 2 | a | + | 750 | ) |
| Multiply both sides of the equation by: | ( | a | + | 150 | ) | , | ( | 2 | a | + | 750 | ) |
| 300 | ( | 2 | a | + | 750 | ) | = | ( | a | + | 600 | ) | ( | a | + | 150 | ) |
| 300 | × | 2 | a | + | 300 | × | 750 | = | ( | a | + | 600 | ) | ( | a | + | 150 | ) |
| 300 | × | 2 | a | + | 300 | × | 750 | = | a | ( | a | + | 150 | ) | + | 600 | ( | a | + | 150 | ) |
| 600 | a | + | 225000 | = | a | ( | a | + | 150 | ) | + | 600 | ( | a | + | 150 | ) |
| 600 | a | + | 225000 | = | a | a | + | a | × | 150 | + | 600 | ( | a | + | 150 | ) |
| 600 | a | + | 225000 | = | a | a | + | 150 | a | + | 600 | a | + | 600 | × | 150 |
| 600 | a | + | 225000 | = | a | a | + | 150 | a | + | 600 | a | + | 90000 |
| 600 | a | + | 225000 | = | a | a | + | 750 | a | + | 90000 |