| ( | 2 | − | 2 | X | ) | ÷ | ( | 3 | − | X | ) | = | 2 5 |
| 方程两边同时乘以: | ( | 3 | − | X | ) |
| ( | 2 | − | 2 | X | ) | = | 2 5 | ( | 3 | − | X | ) |
| 2 | − | 2 | X | = | 2 5 | ( | 3 | − | X | ) |
| 2 | − | 2 | X | = | 2 5 | × | 3 | − | 2 5 | X |
| 2 | − | 2 | X | = | 6 5 | − | 2 5 | X |
| - | 2 | X | + | 2 5 | X | = | 6 5 | − | 2 |
| - | 8 5 | X | = | 6 5 | − | 2 |
| - | 8 5 | X | = | - | 4 5 |
4 5 | = | 8 5 | X |
8 5 | X | = | 4 5 |
| X | = | 4 5 | ÷ | 8 5 |
| = | 4 5 | × | 5 8 |
| = | 1 | × | 1 2 |
| X | = | 1 2 |
| X | = | 0.5 |