| 2 | ( | - | 15 | x | + | 3 | ) | + | 3 | ( | 6 | x | − | 2 | ) | − | 8 | = | - | 8 |
| 方程左边 = | - | 2 | × | 15 | x | + | 2 | × | 3 | + | 3 | ( | 6 | x | − | 2 | ) | − | 8 |
| = | - | 30 | x | + | 6 | + | 3 | ( | 6 | x | − | 2 | ) | − | 8 |
| = | - | 30 | x | − | 2 | + | 3 | ( | 6 | x | − | 2 | ) |
| = | - | 30 | x | − | 2 | + | 3 | × | 6 | x | − | 3 | × | 2 |
| = | - | 30 | x | − | 2 | + | 18 | x | − | 6 |
| = | - | 12 | x | − | 8 |
| - | 12 | x | − | 8 | = | - | 8 |
| - | 12 | x | = | - | 8 | + | 8 |
| - | 12 | x | = | - | 0 |
| 0 | = | 12 | x |
| 12 | x | = | 0 |
| x | = | 0 | ÷ | 12 |
| = | 0 | × | 1 12 |
| x | = | 0 |