79 400 | = | 53 10000 | + | 91 50 | ( | y | − | 53 10000 | ) |
| 方程右边 = | 53 10000 | + | 91 50 | y | − | 91 50 | × | 53 10000 |
| = | 53 10000 | + | 91 50 | y | − | 4823 500000 |
| = | - | 2173 500000 | + | 91 50 | y |
79 400 | = | - | 2173 500000 | + | 91 50 | y |
| - | 91 50 | y | = | - | 2173 500000 | − | 79 400 |
| - | 91 50 | y | = | - | 100923 500000 |
100923 500000 | = | 91 50 | y |
91 50 | y | = | 100923 500000 |
| y | = | 100923 500000 | ÷ | 91 50 |
| = | 100923 500000 | × | 50 91 |
| = | 100923 10000 | × | 1 91 |
| y | = | 100923 910000 |
| y | = | 0.110904 |