| 3 | ( | 2 | x | − | 1 | ) | − | ( | - | 3 | x | − | 4 | ) | ( | 3 | x | − | 4 | ) | = | 0 |
| Left side of the equation = | 3 | × | 2 | x | − | 3 | × | 1 | − | ( | - | 3 | x | − | 4 | ) | ( | 3 | x | − | 4 | ) |
| = | 6 | x | − | 3 | − | ( | - | 3 | x | − | 4 | ) | ( | 3 | x | − | 4 | ) |
| = | 6 | x | − | 3 | + | 3 | x | ( | 3 | x | − | 4 | ) | + | 4 | ( | 3 | x | − | 4 | ) |
| = | 6 | x | − | 3 | + | 3 | x | × | 3 | x | − | 3 | x | × | 4 | + | 4 | ( | 3 | x | − | 4 | ) |
| = | 6 | x | − | 3 | + | 9 | x | x | − | 12 | x | + | 4 | ( | 3 | x | − | 4 | ) |
| = | - | 6 | x | − | 3 | + | 9 | x | x | + | 4 | ( | 3 | x | − | 4 | ) |
| = | - | 6 | x | − | 3 | + | 9 | x | x | + | 4 | × | 3 | x | − | 4 | × | 4 |
| = | - | 6 | x | − | 3 | + | 9 | x | x | + | 12 | x | − | 16 |
| = | 6 | x | − | 19 | + | 9 | x | x |
| 6 | x | − | 19 | + | 9 | x | x | = | 0 |