| ( | 6243 100 | ( | 1 | + | 20 100 | ) | ) | + | ( | 5 100 | x | ) | = | x |
| 方程左边 = | 6243 100 | ( | 1 | + | 20 100 | ) | + | ( | 5 100 | x | ) |
| = | 6243 100 | × | 1 | + | 6243 100 | × | 20 100 | + | ( | 5 100 | x | ) |
| = | 6243 100 | + | 6243 500 | + | ( | 5 100 | x | ) |
| = | 18729 250 | + | ( | 5 100 | x | ) |
| = | 18729 250 | + | 5 100 | x |
18729 250 | + | 5 100 | x | = | x |
5 100 | x | − | x | = | - | 18729 250 |
| - | 19 20 | x | = | - | 18729 250 |
18729 250 | = | 19 20 | x |
19 20 | x | = | 18729 250 |
| x | = | 18729 250 | ÷ | 19 20 |
| = | 18729 250 | × | 20 19 |
| = | 18729 25 | × | 2 19 |
| x | = | 37458 475 |
| x | = | 78.858947 |