| ( | 20977 5 | + | 211 10 | y | ) | ÷ | ( | 100 | + | y | ) | = | 106 5 |
| 方程两边同时乘以: | ( | 100 | + | y | ) |
| ( | 20977 5 | + | 211 10 | y | ) | = | 106 5 | ( | 100 | + | y | ) |
20977 5 | + | 211 10 | y | = | 106 5 | ( | 100 | + | y | ) |
20977 5 | + | 211 10 | y | = | 106 5 | × | 100 | + | 106 5 | y |
20977 5 | + | 211 10 | y | = | 2120 | + | 106 5 | y |
211 10 | y | − | 106 5 | y | = | 2120 | − | 20977 5 |
| - | 1 10 | y | = | 2120 | − | 20977 5 |
| - | 1 10 | y | = | - | 10377 5 |
10377 5 | = | 1 10 | y |
1 10 | y | = | 10377 5 |
| y | = | 10377 5 | ÷ | 1 10 |
| = | 10377 5 | × | 10 |
| = | 10377 | × | 2 |
| y | = | 20754 |