| 1 | ÷ | 2 | × | 3 | ( | - | x | × | 2 | + | 4 | ÷ | 3 | × | x | + | 20 | ÷ | 3 | ) | = | 13 | ÷ | 2 |
| 方程左边 = | 3 2 | ( | - | x | × | 2 | + | 4 | ÷ | 3 | × | x | + | 20 | ÷ | 3 | ) |
3 2 | ( | - | x | × | 2 | + | 4 | ÷ | 3 | × | x | + | 20 | ÷ | 3 | ) | = | 13 | ÷ | 2 |
| 方程左边 = | - | 3 2 | x | × | 2 | + | 3 2 | × | 4 | ÷ | 3 | × | x | + | 3 2 | × | 20 | ÷ | 3 |
| = | - | 3 | x | + | 2 | x | + | 10 |
| = | - | 1 | x | + | 10 |
| - | 1 | x | + | 10 | = | 13 | ÷ | 2 |
| 方程右边 = | 13 2 |
| - | 1 | x | + | 10 | = | 13 2 |
| - | 1 | x | = | 13 2 | − | 10 |
| - | x | = | 13 2 | − | 10 |
| - | x | = | - | 7 2 |
7 2 | = | x |
| x | = | 7 2 |