| ( | 6521 20 | ( | 1 | + | 40 100 | ) | ) | + | ( | 3 100 | x | ) | = | x |
| 方程左边 = | 6521 20 | ( | 1 | + | 40 100 | ) | + | ( | 3 100 | x | ) |
| = | 6521 20 | × | 1 | + | 6521 20 | × | 40 100 | + | ( | 3 100 | x | ) |
| = | 6521 20 | + | 6521 50 | + | ( | 3 100 | x | ) |
| = | 45647 100 | + | ( | 3 100 | x | ) |
| = | 45647 100 | + | 3 100 | x |
45647 100 | + | 3 100 | x | = | x |
3 100 | x | − | x | = | - | 45647 100 |
| - | 97 100 | x | = | - | 45647 100 |
45647 100 | = | 97 100 | x |
97 100 | x | = | 45647 100 |
| x | = | 45647 100 | ÷ | 97 100 |
| = | 45647 100 | × | 100 97 |
| = | 45647 | × | 1 97 |
| x | = | 45647 97 |
| x | = | 470.587629 |