| 2 | ( | 26 | ÷ | 31 | − | x | × | 51 | ÷ | 31 | ) | = | 0 |
| 方程左边 = | 2 | × | 26 | ÷ | 31 | − | 2 | x | × | 51 | ÷ | 31 |
| = | 52 31 | − | 102 31 | x |
52 31 | − | 102 31 | x | = | 0 |
| - | 102 31 | x | = | 0 | − | 52 31 |
| - | 102 31 | x | = | - | 52 31 |
52 31 | = | 102 31 | x |
102 31 | x | = | 52 31 |
| x | = | 52 31 | ÷ | 102 31 |
| = | 52 31 | × | 31 102 |
| = | 26 | × | 1 51 |
| x | = | 26 51 |
| x | = | 0.509804 |