| 1800 | ÷ | ( | 300 | X | × | 40 | X | × | 5 | + | 200 | X | × | 40 | X | × | 5 2 | ) | = | X |
| Multiply both sides of the equation by: | ( | 300 | X | × | 40 | X | × | 5 | + | 200 | X | × | 40 | X | × | 5 2 | ) |
| 1800 | = | X | ( | 300 | X | × | 40 | X | × | 5 | + | 200 | X | × | 40 | X | × | 5 2 | ) |
| 1800 | = | X | × | 300 | X | × | 40 | X | × | 5 | + | X | × | 200 | X | × | 40 | X | × | 5 2 |
| 1800 | = | X | × | 60000 | X | X | + | X | × | 20000 | X | X |