| 5 | x | x | + | ( | 2 | x | − | 3 | ) | ( | 2 | x | − | 3 | ) | = | 14 |
| 方程左边 = | 5 | x | x | + | 2 | x | ( | 2 | x | − | 3 | ) | − | 3 | ( | 2 | x | − | 3 | ) |
| = | 5 | x | x | + | 2 | x | × | 2 | x | − | 2 | x | × | 3 | − | 3 | ( | 2 | x | − | 3 | ) |
| = | 5 | x | x | + | 4 | x | x | − | 6 | x | − | 3 | ( | 2 | x | − | 3 | ) |
| = | 5 | x | x | + | 4 | x | x | − | 6 | x | − | 3 | × | 2 | x | + | 3 |
| = | 5 | x | x | + | 4 | x | x | − | 6 | x | − | 6 | x | + | 9 |
| = | 5 | x | x | + | 4 | x | x | − | 12 | x | + | 9 |
| 5 | x | x | + | 4 | x | x | − | 12 | x | + | 9 | = | 14 |
| x1= | - | 1 3 |
| x2= | 5 3 |