| 4 | ( | x | − | 2 | ) | × | 2 | − | ( | 3 | x | − | 1 | ) | = | 0 |
| 方程左边 = | 8 | ( | x | − | 2 | ) | − | ( | 3 | x | − | 1 | ) |
| 8 | ( | x | − | 2 | ) | − | ( | 3 | x | − | 1 | ) | = | 0 |
| 方程左边 = | 8 | x | − | 8 | × | 2 | − | ( | 3 | x | − | 1 | ) |
| = | 8 | x | − | 16 | − | ( | 3 | x | − | 1 | ) |
| = | 8 | x | − | 16 | − | 3 | x | + | 1 |
| = | 5 | x | − | 15 |
| 5 | x | − | 15 | = | 0 |
| 5 | x | = | 0 | + | 15 |
| 5 | x | = | 15 |
| x | = | 15 | ÷ | 5 |
| = | 15 | × | 1 5 |
| = | 3 | × | 1 |
| x | = | 3 |