| 2 | ( | 2 | x | − | 1 | ) | = | 3 | ( | x | + | 2 | ) | − | ( | x | + | 6 | ) |
| 方程左边 = | 2 | × | 2 | x | − | 2 | × | 1 |
| = | 4 | x | − | 2 |
| 4 | x | − | 2 | = | 3 | ( | x | + | 2 | ) | − | ( | x | + | 6 | ) |
| 方程右边 = | 3 | x | + | 3 | × | 2 | − | ( | x | + | 6 | ) |
| = | 3 | x | + | 6 | − | ( | x | + | 6 | ) |
| = | 3 | x | + | 6 | − | x | − | 6 |
| = | 2 | x | + | 0 |
| 4 | x | − | 2 | = | 2 | x | + | 0 |
| 4 | x | − | 2 | x | = | 2 |
| 2 | x | = | 2 |
| x | = | 2 | ÷ | 2 |
| = | 2 | × | 1 2 |
| = | 1 | × | 1 |
| x | = | 1 |