| 25 | x | ÷ | ( | 10 | ( | 12 | − | x | ) | ) | = | 10 | ÷ | 8 |
| Multiply both sides of the equation by: | ( | 10 | ( | 12 | − | x | ) | ) |
| 25 | x | = | 10 | ÷ | 8 | × | ( | 10 | ( | 12 | − | x | ) | ) |
| 25 | x | = | 10 | ÷ | 8 | × | 10 | ( | 12 | − | x | ) |
| 25 | x | = | 25 2 | ( | 12 | − | x | ) |
| 25 | x | = | 25 2 | × | 12 | − | 25 2 | x |
| 25 | x | = | 150 | − | 25 2 | x |
| 25 | x | + | 25 2 | x | = | 150 |
75 2 | x | = | 150 |
| x | = | 150 | ÷ | 75 2 |
| = | 150 | × | 2 75 |
| = | 2 | × | 2 |
| x | = | 4 |