3 5 | − | ( | 1 | + | X | ) | ÷ | X | × | 1 10 | × | 2 5 | = | 2 5 |
| 方程两边同时乘以: | X |
3 5 | X | − | ( | 1 | + | X | ) | × | 1 10 | × | 2 5 | = | 2 5 | X |
3 5 | X | − | 1 | × | 1 10 | × | 2 5 | − | X | × | 1 10 | × | 2 5 | = | 2 5 | X |
3 5 | X | − | 1 25 | − | X | × | 1 25 | = | 2 5 | X |
14 25 | X | − | 1 25 | = | 2 5 | X |
14 25 | X | − | 2 5 | X | = | 1 25 |
4 25 | X | = | 1 25 |
| X | = | 1 25 | ÷ | 4 25 |
| = | 1 25 | × | 25 4 |
| = | 1 | × | 1 4 |
| X | = | 1 4 |
| X | = | 0.25 |