| 25 | − | x | x | = | 64 | − | ( | 5 | + | x | ) | ( | 5 | + | x | ) |
| Right side of the equation = | 64 | − | 5 | ( | 5 | + | x | ) | − | x | ( | 5 | + | x | ) |
| = | 64 | − | 5 | × | 5 | − | 5 | x | − | x | ( | 5 | + | x | ) |
| = | 64 | − | 25 | − | 5 | x | − | x | ( | 5 | + | x | ) |
| = | 39 | − | 5 | x | − | x | ( | 5 | + | x | ) |
| = | 39 | − | 5 | x | − | x | × | 5 | − | x | x |
| = | 39 | − | 10 | x | − | x | x |
| 25 | − | x | x | = | 39 | − | 10 | x | − | x | x |
| x= | 7 5 |