| ( | 5571 10 | − | y | ) | ÷ | y | = | 77 1000 |
| 方程两边同时乘以: | y |
| ( | 5571 10 | − | y | ) | = | 77 1000 | y |
5571 10 | − | y | = | 77 1000 | y |
| - | y | − | 77 1000 | y | = | - | 5571 10 |
| - | 1077 1000 | y | = | - | 5571 10 |
5571 10 | = | 1077 1000 | y |
1077 1000 | y | = | 5571 10 |
| y | = | 5571 10 | ÷ | 1077 1000 |
| = | 5571 10 | × | 1000 1077 |
| = | 1857 | × | 100 359 |
| y | = | 185700 359 |
| y | = | 517.270195 |