| ( | 30399 100 | − | y | ) | ÷ | 109 100 | × | 9 100 | + | y | ÷ | 103 100 | × | 3 100 | = | 1929 100 |
| 方程左边 = | ( | 30399 100 | − | y | ) | × | 9 109 | + | y | × | 3 103 |
| ( | 30399 100 | − | y | ) | × | 9 109 | + | 3 103 | y | = | 1929 100 |
| 方程左边 = | 30399 100 | × | 9 109 | − | y | × | 9 109 | + | 3 103 | y |
| = | 273591 10900 | − | y | × | 9 109 | + | 3 103 | y |
| = | 273591 10900 | − | 600 11227 | y |
273591 10900 | − | 600 11227 | y | = | 1929 100 |
| - | 600 11227 | y | = | 1929 100 | − | 273591 10900 |
| - | 600 11227 | y | = | - | 6333 1090 |
6333 1090 | = | 600 11227 | y |
600 11227 | y | = | 6333 1090 |
| y | = | 6333 1090 | ÷ | 600 11227 |
| = | 6333 1090 | × | 11227 600 |
| = | 2111 1090 | × | 11227 200 |
| y | = | 23700197 218000 |
| y | = | 217433 2000 |
| y | = | 108.7165 |