| ( | 3 | y | − | 1 | ) | ÷ | 4 | = | ( | 5 | y | − | 7 | ) | ÷ | 6 |
| 方程左边 = | 3 | y | × | 1 4 | − | 1 | × | 1 4 |
| = | 3 4 | y | − | 1 4 |
3 4 | y | − | 1 4 | = | ( | 5 | y | − | 7 | ) | ÷ | 6 |
| 方程右边 = | 5 | y | × | 1 6 | − | 7 | × | 1 6 |
| = | 5 6 | y | − | 7 6 |
3 4 | y | − | 1 4 | = | 5 6 | y | − | 7 6 |
3 4 | y | − | 5 6 | y | = | - | 7 6 | + | 1 4 |
| - | 1 12 | y | = | - | 7 6 | + | 1 4 |
| - | 1 12 | y | = | - | 11 12 |
11 12 | = | 1 12 | y |
1 12 | y | = | 11 12 |
| y | = | 11 12 | ÷ | 1 12 |
| = | 11 12 | × | 12 |
| = | 11 | × | 1 |
| y | = | 11 |