| ( | y | + | 5 | ) | ÷ | 6 | − | ( | 2 | y | − | 1 | ) | ÷ | 7 | = | ( | 2 | y | + | 4 | ) | ÷ | 42 |
| 方程左边 = | y | × | 1 6 | + | 5 | × | 1 6 | − | ( | 2 | y | − | 1 | ) | × | 1 7 |
| = | y | × | 1 6 | + | 5 6 | − | ( | 2 | y | − | 1 | ) | × | 1 7 |
| = | 1 6 | y | + | 5 6 | − | 2 | y | × | 1 7 | + | 1 | × | 1 7 |
| = | 1 6 | y | + | 5 6 | − | 2 7 | y | + | 1 7 |
| = | - | 5 42 | y | + | 41 42 |
| - | 5 42 | y | + | 41 42 | = | ( | 2 | y | + | 4 | ) | ÷ | 42 |
| 方程右边 = | 2 | y | × | 1 42 | + | 4 | × | 1 42 |
| = | 1 21 | y | + | 2 21 |
| - | 5 42 | y | + | 41 42 | = | 1 21 | y | + | 2 21 |
| - | 5 42 | y | − | 1 21 | y | = | 2 21 | − | 41 42 |
| - | 1 6 | y | = | 2 21 | − | 41 42 |
| - | 1 6 | y | = | - | 37 42 |
37 42 | = | 1 6 | y |
1 6 | y | = | 37 42 |
| y | = | 37 42 | ÷ | 1 6 |
| = | 37 42 | × | 6 |
| = | 37 7 | × | 1 |
| y | = | 37 7 |
| y | = | 5.285714 |