| 100 | + | 211 2 | + | 279 50 | s | − | 279 5 | = | 520 | + | 89 10 | s |
| 方程左边 = | 1497 10 | + | 279 50 | s |
1497 10 | + | 279 50 | s | = | 520 | + | 89 10 | s |
279 50 | s | − | 89 10 | s | = | 520 | − | 1497 10 |
| - | 83 25 | s | = | 520 | − | 1497 10 |
| - | 83 25 | s | = | 3703 10 |
| - | 3703 10 | = | 83 25 | s |
83 25 | s | = | - | 3703 10 |
| s | = | - | 3703 10 | ÷ | 83 25 |
| = | - | 3703 10 | × | 25 83 |
| = | - | 3703 2 | × | 5 83 |
| s | = | - | 18515 166 |
| s | = | - 111.536145 |