7 10 | − | 7 10 | y | + | ( | 168 | ÷ | 232 | ) | y | = | 6888 5 | ÷ | 1908 |
| 方程左边 = | 7 10 | − | 7 10 | y | + | 168 | ÷ | 232 | × | y |
| = | 7 10 | − | 7 10 | y | + | 21 29 | y |
| = | 7 10 | + | 7 290 | y |
7 10 | + | 7 290 | y | = | 6888 5 | ÷ | 1908 |
| 方程右边 = | 574 795 |
7 10 | + | 7 290 | y | = | 574 795 |
7 290 | y | = | 574 795 | − | 7 10 |
7 290 | y | = | 7 318 |
| y | = | 7 318 | ÷ | 7 290 |
| = | 7 318 | × | 290 7 |
| = | 1 159 | × | 145 |
| y | = | 145 159 |
| y | = | 0.91195 |