| ( | x | − | 3 | ) | ( | x | − | 3 | ) | + | 1 | = | 2 | ( | x | − | 3 | ) |
| 方程左边 = | x | ( | x | − | 3 | ) | − | 3 | ( | x | − | 3 | ) | + | 1 |
| = | x | x | − | x | × | 3 | − | 3 | ( | x | − | 3 | ) | + | 1 |
| = | x | x | − | 3 | x | − | 3 | x | + | 3 | × | 3 | + | 1 |
| = | x | x | − | 3 | x | − | 3 | x | + | 9 | + | 1 |
| = | x | x | − | 6 | x | + | 10 |
| x | x | − | 6 | x | + | 10 | = | 2 | ( | x | − | 3 | ) |
| 方程右边 = | 2 | x | − | 2 | × | 3 |
| = | 2 | x | − | 6 |
| x | x | − | 6 | x | + | 10 | = | 2 | x | − | 6 |