| ( | 4000 | + | 180 | + | 350 | + | 7 200 | v | ) | × | 6 5 | + | 6 100 | v | = | v |
| 方程左边 = | 4000 | × | 6 5 | + | 180 | × | 6 5 | + | 350 | × | 6 5 | + | 7 200 | v | × | 6 5 | + | 6 100 | v |
| = | 4800 | + | 216 | + | 420 | + | 21 500 | v | + | 6 100 | v |
| = | 5436 | + | 51 500 | v |
| 5436 | + | 51 500 | v | = | v |
51 500 | v | − | v | = | - | 5436 |
| - | 449 500 | v | = | - | 5436 |
| 5436 | = | 449 500 | v |
449 500 | v | = | 5436 |
| v | = | 5436 | ÷ | 449 500 |
| = | 5436 | × | 500 449 |
| v | = | 2718000 449 |
| v | = | 6053.452116 |