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