| ( | 2 | − | 2 | x | ) | ÷ | ( | 1 | + | x | ) | = | 2 5 |
| 方程两边同时乘以: | ( | 1 | + | x | ) |
| ( | 2 | − | 2 | x | ) | = | 2 5 | ( | 1 | + | x | ) |
| 2 | − | 2 | x | = | 2 5 | ( | 1 | + | x | ) |
| 2 | − | 2 | x | = | 2 5 | × | 1 | + | 2 5 | x |
| 2 | − | 2 | x | = | 2 5 | + | 2 5 | x |
| - | 2 | x | − | 2 5 | x | = | 2 5 | − | 2 |
| - | 12 5 | x | = | 2 5 | − | 2 |
| - | 12 5 | x | = | - | 8 5 |
8 5 | = | 12 5 | x |
12 5 | x | = | 8 5 |
| x | = | 8 5 | ÷ | 12 5 |
| = | 8 5 | × | 5 12 |
| = | 2 | × | 1 3 |
| x | = | 2 3 |
| x | = | 0.666667 |