| ( | 4293 2 | − | y | ) | ÷ | y | = | 31 1000 |
| 方程两边同时乘以: | y |
| ( | 4293 2 | − | y | ) | = | 31 1000 | y |
4293 2 | − | y | = | 31 1000 | y |
| - | y | − | 31 1000 | y | = | - | 4293 2 |
| - | 1031 1000 | y | = | - | 4293 2 |
4293 2 | = | 1031 1000 | y |
1031 1000 | y | = | 4293 2 |
| y | = | 4293 2 | ÷ | 1031 1000 |
| = | 4293 2 | × | 1000 1031 |
| = | 4293 | × | 500 1031 |
| y | = | 2146500 1031 |
| y | = | 2081.959263 |