( | 5 | y | + | 1 | ) | + | ( | 1 | − | y | ) | = | ( | 9 | y | + | 1 | ) | + | ( | 1 | − | 3 | y | ) |
方程左边 = | 5 | y | + | 1 | + | ( | 1 | − | y | ) |
= | 5 | y | + | 1 | + | 1 | − | y |
= | 4 | y | + | 2 |
4 | y | + | 2 | = | ( | 9 | y | + | 1 | ) | + | ( | 1 | − | 3 | y | ) |
方程右边 = | 9 | y | + | 1 | + | ( | 1 | − | 3 | y | ) |
= | 9 | y | + | 1 | + | 1 | − | 3 | y |
= | 6 | y | + | 2 |
4 | y | + | 2 | = | 6 | y | + | 2 |
4 | y | − | 6 | y | = | 2 | − | 2 |
- | 2 | y | = | 2 | − | 2 |
- | 2 | y | = | 0 |
- | 0 | = | 2 | y |
2 | y | = | - | 0 |
y | = | - | 0 | ÷ | 2 |
= | - | 0 | × | 1 2 |
y | = | 0 |