| ( | 83 | + | y | ) | ÷ | 2 | × | 7 10 | + | 238 | ÷ | 710 | × | 100 | × | 3 10 | = | 60 |
| 方程左边 = | ( | 83 | + | y | ) | × | 7 20 | + | 714 71 |
| ( | 83 | + | y | ) | × | 7 20 | + | 714 71 | = | 60 |
| 方程左边 = | 83 | × | 7 20 | + | y | × | 7 20 | + | 714 71 |
| = | 581 20 | + | y | × | 7 20 | + | 714 71 |
| = | 55531 1420 | + | 7 20 | y |
55531 1420 | + | 7 20 | y | = | 60 |
7 20 | y | = | 60 | − | 55531 1420 |
7 20 | y | = | 29669 1420 |
| y | = | 29669 1420 | ÷ | 7 20 |
| = | 29669 1420 | × | 20 7 |
| = | 29669 71 | × | 1 7 |
| y | = | 29669 497 |
| y | = | 59.696177 |