| ( | 5 | x | − | 1 | ) | ( | 5 | x | − | 1 | ) | = | 10 |
| Left side of the equation = | 5 | x | ( | 5 | x | − | 1 | ) | − | 1 | ( | 5 | x | − | 1 | ) |
| = | 5 | x | × | 5 | x | − | 5 | x | × | 1 | − | 1 | ( | 5 | x | − | 1 | ) |
| = | 25 | x | x | − | 5 | x | − | 1 | ( | 5 | x | − | 1 | ) |
| = | 25 | x | x | − | 5 | x | − | 1 | × | 5 | x | + | 1 | × | 1 |
| = | 25 | x | x | − | 5 | x | − | 5 | x | + | 1 |
| = | 25 | x | x | − | 10 | x | + | 1 |
| 25 | x | x | − | 10 | x | + | 1 | = | 10 |