853 5 | + | 6111 50 | s | − | 611 5 | = | 520 | + | 89 10 | s |
| 方程左边 = | 242 5 | + | 6111 50 | s |
242 5 | + | 6111 50 | s | = | 520 | + | 89 10 | s |
6111 50 | s | − | 89 10 | s | = | 520 | − | 242 5 |
2833 25 | s | = | 520 | − | 242 5 |
2833 25 | s | = | 2358 5 |
| s | = | 2358 5 | ÷ | 2833 25 |
| = | 2358 5 | × | 25 2833 |
| = | 2358 | × | 5 2833 |
| s | = | 11790 2833 |
| s | = | 4.161666 |