| 3 | ( | 2 | y | − | 3 | ) | − | 4 | y | = | 4 |
| 方程左边 = | 3 | × | 2 | y | − | 3 | × | 3 | − | 4 | y |
| = | 6 | y | − | 9 | − | 4 | y |
| = | 2 | y | − | 9 |
| 2 | y | − | 9 | = | 4 |
| 2 | y | = | 4 | + | 9 |
| 2 | y | = | 13 |
| y | = | 13 | ÷ | 2 |
| = | 13 | × | 1 2 |
| y | = | 13 2 |
| y | = | 6.5 |
| 6 | y | − | 9 | − | 4 | y | = | 4 |
| 方程左边 = | 2 | y | − | 9 |
| 2 | y | − | 9 | = | 4 |
| 2 | y | = | 4 | + | 9 |
| 2 | y | = | 13 |
| y | = | 13 | ÷ | 2 |
| = | 13 | × | 1 2 |
| y | = | 13 2 |
| y | = | 6.5 |