| 4 | = | x | × | 3 20 | ÷ | ( | 3 | × | 6000 | × | 9 5 | ) |
| Multiply both sides of the equation by: | ( | 3 | × | 6000 | × | 9 5 | ) |
| 4 | ( | 3 | × | 6000 | × | 9 5 | ) | = | x | × | 3 20 |
| 4 | × | 3 | × | 6000 | × | 9 5 | = | x | × | 3 20 |
| 129600 | = | x | × | 3 20 |
| - | 3 20 | x | = | - | 129600 |
| 129600 | = | 3 20 | x |
3 20 | x | = | 129600 |
| x | = | 129600 | ÷ | 3 20 |
| = | 129600 | × | 20 3 |
| = | 43200 | × | 20 |
| x | = | 864000 |