| ( | 85 | ( | 1 | + | 20 100 | ) | ) | + | ( | 6 100 | x | ) | = | x |
| 方程左边 = | 85 | ( | 1 | + | 20 100 | ) | + | ( | 6 100 | x | ) |
| = | 85 | × | 1 | + | 85 | × | 20 100 | + | ( | 6 100 | x | ) |
| = | 85 | + | 17 | + | ( | 6 100 | x | ) |
| = | 102 | + | ( | 6 100 | x | ) |
| = | 102 | + | 6 100 | x |
| 102 | + | 6 100 | x | = | x |
6 100 | x | − | x | = | - | 102 |
| - | 47 50 | x | = | - | 102 |
| 102 | = | 47 50 | x |
47 50 | x | = | 102 |
| x | = | 102 | ÷ | 47 50 |
| = | 102 | × | 50 47 |
| x | = | 5100 47 |
| x | = | 108.510638 |