2 5 | = | 19 50 | ( | u | + | 1 | ) | − | 11 50 | u |
| 方程右边 = | 19 50 | u | + | 19 50 | × | 1 | − | 11 50 | u |
| = | 19 50 | u | + | 19 50 | − | 11 50 | u |
| = | 4 25 | u | + | 19 50 |
2 5 | = | 4 25 | u | + | 19 50 |
| - | 4 25 | u | = | 19 50 | − | 2 5 |
| - | 4 25 | u | = | - | 1 50 |
1 50 | = | 4 25 | u |
4 25 | u | = | 1 50 |
| u | = | 1 50 | ÷ | 4 25 |
| = | 1 50 | × | 25 4 |
| = | 1 2 | × | 1 4 |
| u | = | 1 8 |
| u | = | 0.125 |