| ( | x | − | 3 | ) | ( | x | − | 1 | ÷ | 5 | ) | = | 0 |
| 方程左边 = | x | ( | x | − | 1 | ÷ | 5 | ) | − | 3 | ( | x | − | 1 | ÷ | 5 | ) |
| = | x | x | − | x | × | 1 | ÷ | 5 | − | 3 | ( | x | − | 1 | ÷ | 5 | ) |
| = | x | x | − | x | × | 1 5 | − | 3 | ( | x | − | 1 | ÷ | 5 | ) |
| = | x | x | − | 1 5 | x | − | 3 | x | + | 3 | × | 1 | ÷ | 5 |
| = | x | x | − | 1 5 | x | − | 3 | x | + | 3 5 |
| = | x | x | − | 16 5 | x | + | 3 5 |
| x | x | − | 16 5 | x | + | 3 5 | = | 0 |
| x1= | 1 5 |
| x2=3 |