41 2 | x | + | 5 | × | 21 5 | = | 51 2 | ( | x | − | 2 25 | ) |
| 方程左边 = | 41 2 | x | + | 21 |
41 2 | x | + | 21 | = | 51 2 | ( | x | − | 2 25 | ) |
| 方程右边 = | 51 2 | x | − | 51 2 | × | 2 25 |
| = | 51 2 | x | − | 51 25 |
41 2 | x | + | 21 | = | 51 2 | x | − | 51 25 |
41 2 | x | − | 51 2 | x | = | - | 51 25 | − | 21 |
| - | 5 | x | = | - | 51 25 | − | 21 |
| - | 5 | x | = | - | 576 25 |
576 25 | = | 5 | x |
| 5 | x | = | 576 25 |
| x | = | 576 25 | ÷ | 5 |
| = | 576 25 | × | 1 5 |
| x | = | 576 125 |
| x | = | 4.608 |