| 1000 | v | + | 2500 | ( | 1 100 | − | v | ) | = | 509 50 |
| 方程左边 = | 1000 | v | + | 2500 | × | 1 100 | − | 2500 | v |
| = | 1000 | v | + | 25 | − | 2500 | v |
| = | - | 1500 | v | + | 25 |
| - | 1500 | v | + | 25 | = | 509 50 |
| - | 1500 | v | = | 509 50 | − | 25 |
| - | 1500 | v | = | - | 741 50 |
741 50 | = | 1500 | v |
| 1500 | v | = | 741 50 |
| v | = | 741 50 | ÷ | 1500 |
| = | 741 50 | × | 1 1500 |
| = | 247 50 | × | 1 500 |
| v | = | 247 25000 |
| v | = | 0.00988 |