| x | ÷ | ( | 100 | + | x | ) | = | 213 10000 |
| 方程两边同时乘以: | ( | 100 | + | x | ) |
| x | = | 213 10000 | ( | 100 | + | x | ) |
| x | = | 213 10000 | × | 100 | + | 213 10000 | x |
| x | = | 213 100 | + | 213 10000 | x |
| x | − | 213 10000 | x | = | 213 100 |
9787 10000 | x | = | 213 100 |
| x | = | 213 100 | ÷ | 9787 10000 |
| = | 213 100 | × | 10000 9787 |
| = | 213 | × | 100 9787 |
| x | = | 21300 9787 |
| x | = | 2.176356 |