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