| ( | 5 2 | y | − | y | ) | ÷ | 3 | = | ( | 5 2 | y | + | y | ) | ÷ | 2 | + | 1 |
| 方程左边 = | 5 2 | y | × | 1 3 | − | y | × | 1 3 |
| = | 5 6 | y | − | y | × | 1 3 |
| = | 1 2 | y |
1 2 | y | = | ( | 5 2 | y | + | y | ) | ÷ | 2 | + | 1 |
| 方程右边 = | 5 2 | y | × | 1 2 | + | y | × | 1 2 | + | 1 |
| = | 5 4 | y | + | y | × | 1 2 | + | 1 |
| = | 7 4 | y | + | 1 |
1 2 | y | = | 7 4 | y | + | 1 |
1 2 | y | − | 7 4 | y | = | 1 |
| - | 5 4 | y | = | 1 |
| - | 1 | = | 5 4 | y |
5 4 | y | = | - | 1 |
| y | = | - | 1 | ÷ | 5 4 |
| = | - | 1 | × | 4 5 |
| y | = | - | 4 5 |
| y | = | - 0.8 |