| ( | 5441 10 | − | y | ) | ÷ | y | = | 69 1000 |
| 方程两边同时乘以: | y |
| ( | 5441 10 | − | y | ) | = | 69 1000 | y |
5441 10 | − | y | = | 69 1000 | y |
| - | y | − | 69 1000 | y | = | - | 5441 10 |
| - | 1069 1000 | y | = | - | 5441 10 |
5441 10 | = | 1069 1000 | y |
1069 1000 | y | = | 5441 10 |
| y | = | 5441 10 | ÷ | 1069 1000 |
| = | 5441 10 | × | 1000 1069 |
| = | 5441 | × | 100 1069 |
| y | = | 544100 1069 |
| y | = | 508.980355 |