| ( | 672 5 | ( | 1 | + | 20 100 | ) | ) | + | ( | 3 100 | x | ) | = | x |
| 方程左边 = | 672 5 | ( | 1 | + | 20 100 | ) | + | ( | 3 100 | x | ) |
| = | 672 5 | × | 1 | + | 672 5 | × | 20 100 | + | ( | 3 100 | x | ) |
| = | 672 5 | + | 672 25 | + | ( | 3 100 | x | ) |
| = | 4032 25 | + | ( | 3 100 | x | ) |
| = | 4032 25 | + | 3 100 | x |
4032 25 | + | 3 100 | x | = | x |
3 100 | x | − | x | = | - | 4032 25 |
| - | 97 100 | x | = | - | 4032 25 |
4032 25 | = | 97 100 | x |
97 100 | x | = | 4032 25 |
| x | = | 4032 25 | ÷ | 97 100 |
| = | 4032 25 | × | 100 97 |
| = | 4032 | × | 4 97 |
| x | = | 16128 97 |
| x | = | 166.268041 |