| x | ÷ | ( | 7 200 | − | x | ) | = | 3 5 |
| Multiply both sides of the equation by: | ( | 7 200 | − | x | ) |
| x | = | 3 5 | ( | 7 200 | − | x | ) |
| x | = | 3 5 | × | 7 200 | − | 3 5 | x |
| x | = | 21 1000 | − | 3 5 | x |
| x | + | 3 5 | x | = | 21 1000 |
8 5 | x | = | 21 1000 |
| x | = | 21 1000 | ÷ | 8 5 |
| = | 21 1000 | × | 5 8 |
| = | 21 200 | × | 1 8 |
| x | = | 21 1600 |
| x | = | 0.013125 |