| - | 3 | a | ÷ | ( | - | 2 | ) | − | 2 | ÷ | ( | - | 2 | ) | = | 2 |
| 方程两边同时乘以: | ( | - | 2 | ) |
| - | 3 | a | − | 2 | ÷ | ( | - | 2 | ) | × | ( | - | 2 | ) | = | 2 | ( | - | 2 | ) |
| - | 3 | a | + | 2 | ÷ | ( | - | 2 | ) | × | 2 | = | 2 | ( | - | 2 | ) |
| - | 3 | a | + | 2 | ÷ | ( | - | 2 | ) | × | 2 | = | - | 2 | × | 2 |
| - | 3 | a | + | 4 | ÷ | ( | - | 2 | ) | = | - | 4 |
| 方程两边同时乘以: | ( | - | 2 | ) |
| - | 3 | a | ( | - | 2 | ) | + | 4 | = | - | 4 | ( | - | 2 | ) |
| 3 | a | × | 2 | + | 4 | = | - | 4 | ( | - | 2 | ) |
| 3 | a | × | 2 | + | 4 | = | 4 | × | 2 |
| 6 | a | + | 4 | = | 8 |
| 6 | a | = | 8 | − | 4 |
| 6 | a | = | 4 |
| a | = | 4 | ÷ | 6 |
| = | 4 | × | 1 6 |
| = | 2 | × | 1 3 |
| a | = | 2 3 |
| a | = | 0.666667 |