| 3 | ( | X | − | 2 | ) | − | 12 | ( | X | − | 2 | ) | + | ( | X | + | 1 | ) | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) | = | 0 |
| Left side of the equation = | 3 | X | − | 3 | × | 2 | − | 12 | ( | X | − | 2 | ) | + | ( | X | + | 1 | ) | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | 3 | X | − | 6 | − | 12 | ( | X | − | 2 | ) | + | ( | X | + | 1 | ) | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | 3 | X | − | 6 | − | 12 | X | + | 12 | × | 2 | + | ( | X | + | 1 | ) | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | 3 | X | − | 6 | − | 12 | X | + | 24 | + | ( | X | + | 1 | ) | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | - | 9 | X | + | 18 | + | ( | X | + | 1 | ) | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | - | 9 | X | + | 18 | + | X | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) | + | 1 | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | - | 9 | X | + | 18 | + | X | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | X | × | 4 | ( | X | − | 2 | ) | + | 1 | ( | ( | X | − | 3 | ) | ( | X | − | 2 | ) | + | 4 | ( | X | − | 2 | ) | ) |
| = | - | 9 | X | + | 18 | + | X | X | ( | X | − | 2 | ) | − | X | × | 3 | ( | X | − | 2 | ) | + | X | × | 4 | ( | X | − | 2 | ) |
| = | - | 9 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | ( | X | − | 2 | ) |
| = | - | 9 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 9 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 3 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 3 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 3 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 11 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 13 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 13 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 13 | X | + | 18 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |
| = | - | 16 | X | + | 24 | + | X | X | X | − | X | X | × | 2 | − | X | × | 3 | X |