| 6 | × | 12 | − | 1 2 | x | × | 12 | − | x | ( | 6 | − | x | ) | − | 3 | ( | 12 | − | 2 | x | ) | = | 8 |
| Left side of the equation = | 72 | − | 6 | x | − | x | ( | 6 | − | x | ) | − | 3 | ( | 12 | − | 2 | x | ) |
| 72 | − | 6 | x | − | x | ( | 6 | − | x | ) | − | 3 | ( | 12 | − | 2 | x | ) | = | 8 |
| Left side of the equation = | 72 | − | 6 | x | − | x | × | 6 | + | x | x | − | 3 | ( | 12 | − | 2 | x | ) |
| = | 72 | − | 12 | x | + | x | x | − | 3 | ( | 12 | − | 2 | x | ) |
| = | 72 | − | 12 | x | + | x | x | − | 3 | × | 12 | + | 3 | × | 2 | x |
| = | 72 | − | 12 | x | + | x | x | − | 36 | + | 6 | x |
| = | 36 | − | 6 | x | + | x | x |
| 36 | − | 6 | x | + | x | x | = | 8 |