| 1200 | ÷ | x | + | 2400 | ÷ | 3 2 | ÷ | x | = | 10 |
| Multiply both sides of the equation by: | x |
| 1200 | + | 2400 | ÷ | 3 2 | ÷ | 1 | × | 1 | = | 10 | x |
| - | 10 | x | = | - | 1200 | − | 2400 | ÷ | 3 2 | ÷ | 1 | × | 1 |
| - | 10 | x | = | - | 1200 | − | 1600 |
| - | 10 | x | = | - | 2800 |
| 2800 | = | 10 | x |
| 10 | x | = | 2800 |
| x | = | 2800 | ÷ | 10 |
| = | 2800 | × | 1 10 |
| = | 280 | × | 1 |
| x | = | 280 |