| ( | 5 | ( | 1 | + | 20 100 | ) | ) | + | ( | 3 100 | x | ) | = | x |
| 方程左边 = | 5 | ( | 1 | + | 20 100 | ) | + | ( | 3 100 | x | ) |
| = | 5 | × | 1 | + | 5 | × | 20 100 | + | ( | 3 100 | x | ) |
| = | 5 | + | 1 | + | ( | 3 100 | x | ) |
| = | 6 | + | ( | 3 100 | x | ) |
| = | 6 | + | 3 100 | x |
| 6 | + | 3 100 | x | = | x |
3 100 | x | − | x | = | - | 6 |
| - | 97 100 | x | = | - | 6 |
| 6 | = | 97 100 | x |
97 100 | x | = | 6 |
| x | = | 6 | ÷ | 97 100 |
| = | 6 | × | 100 97 |
| x | = | 600 97 |
| x | = | 6.185567 |