| ( | 663 | ( | 1 | + | 20 100 | ) | ) | + | ( | 7 100 | x | ) | = | x |
| 方程左边 = | 663 | ( | 1 | + | 20 100 | ) | + | ( | 7 100 | x | ) |
| = | 663 | × | 1 | + | 663 | × | 20 100 | + | ( | 7 100 | x | ) |
| = | 663 | + | 663 5 | + | ( | 7 100 | x | ) |
| = | 3978 5 | + | ( | 7 100 | x | ) |
| = | 3978 5 | + | 7 100 | x |
3978 5 | + | 7 100 | x | = | x |
7 100 | x | − | x | = | - | 3978 5 |
| - | 93 100 | x | = | - | 3978 5 |
3978 5 | = | 93 100 | x |
93 100 | x | = | 3978 5 |
| x | = | 3978 5 | ÷ | 93 100 |
| = | 3978 5 | × | 100 93 |
| = | 1326 | × | 20 31 |
| x | = | 26520 31 |
| x | = | 855.483871 |