| ( | v | − | 201 10 | ) | ( | - | 301 10 | ) | = | 20 | v |
| 方程左边 = | v | ( | - | 301 10 | ) | − | 201 10 | ( | - | 301 10 | ) |
| = | - | v | × | 301 10 | − | 201 10 | ( | - | 301 10 | ) |
| = | - | 301 10 | v | + | 201 10 | × | 301 10 |
| = | - | 301 10 | v | + | 60501 100 |
| - | 301 10 | v | + | 60501 100 | = | 20 | v |
| - | 301 10 | v | − | 20 | v | = | - | 60501 100 |
| - | 501 10 | v | = | - | 60501 100 |
60501 100 | = | 501 10 | v |
501 10 | v | = | 60501 100 |
| v | = | 60501 100 | ÷ | 501 10 |
| = | 60501 100 | × | 10 501 |
| = | 20167 10 | × | 1 167 |
| v | = | 20167 1670 |
| v | = | 12.076048 |