| 3 | ( | x | + | 2 | ) | − | 6 | ( | x | − | 1 | ) | = | 10 | ( | x | + | 3 | ) | − | 15 | ( | x | − | 2 | ) |
| 方程左边 = | 3 | x | + | 3 | × | 2 | − | 6 | ( | x | − | 1 | ) |
| = | 3 | x | + | 6 | − | 6 | ( | x | − | 1 | ) |
| = | 3 | x | + | 6 | − | 6 | x | + | 6 | × | 1 |
| = | 3 | x | + | 6 | − | 6 | x | + | 6 |
| = | - | 3 | x | + | 12 |
| - | 3 | x | + | 12 | = | 10 | ( | x | + | 3 | ) | − | 15 | ( | x | − | 2 | ) |
| 方程右边 = | 10 | x | + | 10 | × | 3 | − | 15 | ( | x | − | 2 | ) |
| = | 10 | x | + | 30 | − | 15 | ( | x | − | 2 | ) |
| = | 10 | x | + | 30 | − | 15 | x | + | 15 | × | 2 |
| = | 10 | x | + | 30 | − | 15 | x | + | 30 |
| = | - | 5 | x | + | 60 |
| - | 3 | x | + | 12 | = | - | 5 | x | + | 60 |
| - | 3 | x | + | 5 | x | = | 60 | − | 12 |
| 2 | x | = | 60 | − | 12 |
| 2 | x | = | 48 |
| x | = | 48 | ÷ | 2 |
| = | 48 | × | 1 2 |
| = | 24 | × | 1 |
| x | = | 24 |