| - | ( | 3 | X | − | 1 | ) | ( | 2 | − | X | ) | ( | 3 | X | + | 4 | ) | = | 0 |
| 方程左边 = | - | 3 | X | ( | 2 | − | X | ) | ( | 3 | X | + | 4 | ) | + | 1 | ( | 2 | − | X | ) | ( | 3 | X | + | 4 | ) |
| = | - | 3 | X | × | 2 | ( | 3 | X | + | 4 | ) | + | 3 | X | X | ( | 3 | X | + | 4 | ) | + | 1 | ( | 2 | − | X | ) | ( | 3 | X | + | 4 | ) |
| = | - | 6 | X | ( | 3 | X | + | 4 | ) | + | 3 | X | X | ( | 3 | X | + | 4 | ) | + | 1 | ( | 2 | − | X | ) | ( | 3 | X | + | 4 | ) |
| = | - | 6 | X | × | 3 | X | − | 6 | X | × | 4 | + | 3 | X | X | ( | 3 | X | + | 4 | ) | + | 1 |
| = | - | 18 | X | X | − | 24 | X | + | 3 | X | X | ( | 3 | X | + | 4 | ) | + | 1 | ( | 2 | − | X | ) | ( | 3 | X | + | 4 | ) |
| = | - | 18 | X | X | − | 24 | X | + | 3 | X | X | × | 3 | X | + | 3 | X |
| = | - | 18 | X | X | − | 24 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 24 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 24 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 24 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 24 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 18 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 18 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 18 | X | + | 9 | X | X | X | + | 12 | X | X |
| = | - | 18 | X | X | − | 22 | X | + | 9 | X | X | X | + | 12 | X | X |
| - | 18 | X | X | − | 22 | X | + | 9 | X | X | X | + | 12 | X | X | = | 0 |
| X1= | - | 4 3 |
| X2= | 1 3 |
| X3=2 |