| - | ( | 1 | ÷ | 12 | ) | ( | x | − | 6 | ) | ( | x | − | 6 | ) | + | 4 | = | 0 |
| Left side of the equation = | - | 1 | ÷ | 12 | × | ( | x | − | 6 | ) | ( | x | − | 6 | ) | + | 4 |
| = | - | 1 12 | ( | x | − | 6 | ) | ( | x | − | 6 | ) | + | 4 |
| = | - | 1 12 | x | ( | x | − | 6 | ) | + | 1 12 | × | 6 | ( | x | − | 6 | ) | + | 4 |
| = | - | 1 12 | x | ( | x | − | 6 | ) | + | 1 2 | ( | x | − | 6 | ) | + | 4 |
| = | - | 1 12 | x | x | + | 1 12 | x | × | 6 | + | 1 2 | ( | x | − | 6 | ) | + | 4 |
| = | - | 1 12 | x | x | + | 1 2 | x | + | 1 2 | ( | x | − | 6 | ) | + | 4 |
| = | - | 1 12 | x | x | + | 1 2 | x | + | 1 2 | x | − | 1 2 | × | 6 | + | 4 |
| = | - | 1 12 | x | x | + | 1 2 | x | + | 1 2 | x | − | 3 | + | 4 |
| = | - | 1 12 | x | x | + | 1 | x | + | 1 |
| - | 1 12 | x | x | + | 1 | x | + | 1 | = | 0 |