| ( | 1 | + | x | ) | ÷ | x | × | 1 10 | × | 3 10 | = | 2 5 |
| 方程两边同时乘以: | x |
| ( | 1 | + | x | ) | × | 1 10 | × | 3 10 | = | 2 5 | x |
| 1 | × | 1 10 | × | 3 10 | + | x | × | 1 10 | × | 3 10 | = | 2 5 | x |
3 100 | + | x | × | 3 100 | = | 2 5 | x |
3 100 | x | − | 2 5 | x | = | - | 3 100 |
| - | 37 100 | x | = | - | 3 100 |
3 100 | = | 37 100 | x |
37 100 | x | = | 3 100 |
| x | = | 3 100 | ÷ | 37 100 |
| = | 3 100 | × | 100 37 |
| = | 3 | × | 1 37 |
| x | = | 3 37 |
| x | = | 0.081081 |