| ( | 1 | − | x | ) | ÷ | ( | 1 | + | x | ) | = | 1 5 |
| 方程两边同时乘以: | ( | 1 | + | x | ) |
| ( | 1 | − | x | ) | = | 1 5 | ( | 1 | + | x | ) |
| 1 | − | x | = | 1 5 | ( | 1 | + | x | ) |
| 1 | − | x | = | 1 5 | × | 1 | + | 1 5 | x |
| 1 | − | x | = | 1 5 | + | 1 5 | x |
| - | x | − | 1 5 | x | = | 1 5 | − | 1 |
| - | 6 5 | x | = | 1 5 | − | 1 |
| - | 6 5 | x | = | - | 4 5 |
4 5 | = | 6 5 | x |
6 5 | x | = | 4 5 |
| x | = | 4 5 | ÷ | 6 5 |
| = | 4 5 | × | 5 6 |
| = | 2 | × | 1 3 |
| x | = | 2 3 |
| x | = | 0.666667 |