| Y | = | 4 5 | ( | Y | − | 10 | ) | + | 20 | + | 40 | + | 50 | − | 1 2 | Y |
| 方程右边 = | 4 5 | ( | Y | − | 10 | ) | + | 110 | − | 1 2 | Y |
| Y | = | 4 5 | ( | Y | − | 10 | ) | + | 110 | − | 1 2 | Y |
| 方程右边 = | 4 5 | Y | − | 4 5 | × | 10 | + | 110 | − | 1 2 | Y |
| = | 4 5 | Y | − | 8 | + | 110 | − | 1 2 | Y |
| = | 3 10 | Y | + | 102 |
| Y | = | 3 10 | Y | + | 102 |
| Y | − | 3 10 | Y | = | 102 |
7 10 | Y | = | 102 |
| Y | = | 102 | ÷ | 7 10 |
| = | 102 | × | 10 7 |
| Y | = | 1020 7 |
| Y | = | 145.714286 |