| 520 | + | 89 10 | s | = | 853 5 | + | 611 50 | s | − | 611 5 |
| Right side of the equation = | 242 5 | + | 611 50 | s |
| 520 | + | 89 10 | s | = | 242 5 | + | 611 50 | s |
89 10 | s | − | 611 50 | s | = | 242 5 | − | 520 |
| - | 83 25 | s | = | 242 5 | − | 520 |
| - | 83 25 | s | = | - | 2358 5 |
2358 5 | = | 83 25 | s |
83 25 | s | = | 2358 5 |
| s | = | 2358 5 | ÷ | 83 25 |
| = | 2358 5 | × | 25 83 |
| = | 2358 | × | 5 83 |
| s | = | 11790 83 |
| s | = | 142.048193 |