| 30 | ( | 1 | − | y | ) | + | 60 | y | = | 1207 50 | ( | 1 | − | y | ) | + | 7833 100 | y |
| 方程左边 = | 30 | × | 1 | − | 30 | y | + | 60 | y |
| = | 30 | − | 30 | y | + | 60 | y |
| = | 30 | + | 30 | y |
| 30 | + | 30 | y | = | 1207 50 | ( | 1 | − | y | ) | + | 7833 100 | y |
| 方程右边 = | 1207 50 | × | 1 | − | 1207 50 | y | + | 7833 100 | y |
| = | 1207 50 | − | 1207 50 | y | + | 7833 100 | y |
| = | 1207 50 | + | 5419 100 | y |
| 30 | + | 30 | y | = | 1207 50 | + | 5419 100 | y |
| 30 | y | − | 5419 100 | y | = | 1207 50 | − | 30 |
| - | 2419 100 | y | = | 1207 50 | − | 30 |
| - | 2419 100 | y | = | - | 293 50 |
293 50 | = | 2419 100 | y |
2419 100 | y | = | 293 50 |
| y | = | 293 50 | ÷ | 2419 100 |
| = | 293 50 | × | 100 2419 |
| = | 293 | × | 2 2419 |
| y | = | 586 2419 |
| y | = | 0.242249 |