| ( | 140 | ( | 1 | + | 20 100 | ) | ) | + | ( | 6 100 | x | ) | = | x |
| 方程左边 = | 140 | ( | 1 | + | 20 100 | ) | + | ( | 6 100 | x | ) |
| = | 140 | × | 1 | + | 140 | × | 20 100 | + | ( | 6 100 | x | ) |
| = | 140 | + | 28 | + | ( | 6 100 | x | ) |
| = | 168 | + | ( | 6 100 | x | ) |
| = | 168 | + | 6 100 | x |
| 168 | + | 6 100 | x | = | x |
6 100 | x | − | x | = | - | 168 |
| - | 47 50 | x | = | - | 168 |
| 168 | = | 47 50 | x |
47 50 | x | = | 168 |
| x | = | 168 | ÷ | 47 50 |
| = | 168 | × | 50 47 |
| x | = | 8400 47 |
| x | = | 178.723404 |