| 2 | ( | 10 | − | 3 2 | y | ) | = | - | ( | 5 2 | y | + | 2 | ) |
| 方程左边 = | 2 | × | 10 | − | 2 | × | 3 2 | y |
| = | 20 | − | 3 | y |
| 20 | − | 3 | y | = | - | ( | 5 2 | y | + | 2 | ) |
| 方程右边 = | - | 5 2 | y | − | 2 |
| 20 | − | 3 | y | = | - | 5 2 | y | − | 2 |
| - | 3 | y | + | 5 2 | y | = | - | 2 | − | 20 |
| - | 1 2 | y | = | - | 2 | − | 20 |
| - | 1 2 | y | = | - | 22 |
| 22 | = | 1 2 | y |
1 2 | y | = | 22 |
| y | = | 22 | ÷ | 1 2 |
| = | 22 | × | 2 |
| y | = | 44 |