| 4 | ( | 2 | y | + | 3 | ) | = | 8 | ( | 1 | − | y | ) | − | 5 | ( | y | − | 2 | ) |
| 方程左边 = | 4 | × | 2 | y | + | 4 | × | 3 |
| = | 8 | y | + | 12 |
| 8 | y | + | 12 | = | 8 | ( | 1 | − | y | ) | − | 5 | ( | y | − | 2 | ) |
| 方程右边 = | 8 | × | 1 | − | 8 | y | − | 5 | ( | y | − | 2 | ) |
| = | 8 | − | 8 | y | − | 5 | ( | y | − | 2 | ) |
| = | 8 | − | 8 | y | − | 5 | y | + | 5 | × | 2 |
| = | 8 | − | 8 | y | − | 5 | y | + | 10 |
| = | 18 | − | 13 | y |
| 8 | y | + | 12 | = | 18 | − | 13 | y |
| 8 | y | + | 13 | y | = | 18 | − | 12 |
| 21 | y | = | 18 | − | 12 |
| 21 | y | = | 6 |
| y | = | 6 | ÷ | 21 |
| = | 6 | × | 1 21 |
| = | 2 | × | 1 7 |
| y | = | 2 7 |
| y | = | 0.285714 |