| 6000 | ÷ | a | + | 30000 | ÷ | ( | a | + | 112 5 | ) | + | 40000 | ÷ | a | = | 450 |
| Multiply both sides of the equation by: | a |
| 6000 | + | 30000 | ÷ | ( | a | + | 112 5 | ) | × | a | + | 40000 | ÷ | 1 | × | 1 | = | 450 | a |
| Multiply both sides of the equation by: | ( | a | + | 112 5 | ) |
| 6000 | ( | a | + | 112 5 | ) | + | 30000 | a | + | 40000 | ÷ | 1 | × | 1 | ( | a | + | 112 5 | ) | = | 450 | a | ( | a | + | 112 5 | ) |
| 6000 | a | + | 6000 | × | 112 5 | + | 30000 | a | + | 40000 | ÷ | 1 | × | 1 | ( | a | + | 112 5 | ) | = | 450 | a | ( | a | + | 112 5 | ) |
| 6000 | a | + | 6000 | × | 112 5 | + | 30000 | a | + | 40000 | ÷ | 1 | × | 1 | ( | a | + | 112 5 | ) | = | 450 | a | a | + | 450 | a | × | 112 5 |
| 6000 | a | + | 134400 | + | 30000 | a | + | 40000 | ( | a | + | 112 5 | ) | = | 450 | a | a | + | 10080 | a |
| 36000 | a | + | 134400 | + | 40000 | ( | a | + | 112 5 | ) | = | 450 | a | a | + | 10080 | a |
| 36000 | a | + | 134400 | + | 40000 | a | + | 40000 | × | 112 5 | = | 450 | a | a | + | 10080 | a |
| 36000 | a | + | 134400 | + | 40000 | a | + | 896000 | = | 450 | a | a | + | 10080 | a |
| 76000 | a | + | 1030400 | = | 450 | a | a | + | 10080 | a |