| ( | 5 | x | − | 2 | ) | ( | 8 | x | − | 2 | ) | = | 10 |
| Left side of the equation = | 5 | x | ( | 8 | x | − | 2 | ) | − | 2 | ( | 8 | x | − | 2 | ) |
| = | 5 | x | × | 8 | x | − | 5 | x | × | 2 | − | 2 | ( | 8 | x | − | 2 | ) |
| = | 40 | x | x | − | 10 | x | − | 2 | ( | 8 | x | − | 2 | ) |
| = | 40 | x | x | − | 10 | x | − | 2 | × | 8 | x | + | 2 | × | 2 |
| = | 40 | x | x | − | 10 | x | − | 16 | x | + | 4 |
| = | 40 | x | x | − | 26 | x | + | 4 |
| 40 | x | x | − | 26 | x | + | 4 | = | 10 |