| x | ÷ | ( | 100 | + | x | ) | = | 521 5000 |
| 方程两边同时乘以: | ( | 100 | + | x | ) |
| x | = | 521 5000 | ( | 100 | + | x | ) |
| x | = | 521 5000 | × | 100 | + | 521 5000 | x |
| x | = | 521 50 | + | 521 5000 | x |
| x | − | 521 5000 | x | = | 521 50 |
4479 5000 | x | = | 521 50 |
| x | = | 521 50 | ÷ | 4479 5000 |
| = | 521 50 | × | 5000 4479 |
| = | 521 | × | 100 4479 |
| x | = | 52100 4479 |
| x | = | 11.632061 |