| ( | 8 | − | x | ) | ( | 6 | − | 2 | x | ) | = | 1 8 | × | 12 | × | 10 |
| Left side of the equation = | 8 | ( | 6 | − | 2 | x | ) | − | x | ( | 6 | − | 2 | x | ) |
| = | 8 | × | 6 | − | 8 | × | 2 | x | − | x | ( | 6 | − | 2 | x | ) |
| = | 48 | − | 16 | x | − | x | ( | 6 | − | 2 | x | ) |
| = | 48 | − | 16 | x | − | x | × | 6 | + | x | × | 2 | x |
| = | 48 | − | 22 | x | + | x | × | 2 | x |
| 48 | − | 22 | x | + | x | × | 2 | x | = | 1 8 | × | 12 | × | 10 |
| Right side of the equation = | 15 |
| 48 | − | 22 | x | + | x | × | 2 | x | = | 15 |