| 3 | ÷ | X | + | ( | 1 | − | 2 | ÷ | 1 | × | ( | 4 | X | − | 1 | ) | ) | = | 1 |
| 方程两边同时乘以: | X |
| 3 | + | ( | 1 | − | 2 | ÷ | 1 | × | ( | 4 | X | − | 1 | ) | ) | X | = | 1 | X |
| 3 | + | 1 | X | − | 2 | ÷ | 1 | × | ( | 4 | X | − | 1 | ) | X | = | 1 | X |
| 3 | + | 1 | X | − | 2 | ( | 4 | X | − | 1 | ) | X | = | 1 | X |
| 3 | + | 1 | X | − | 2 | × | 4 | X | X | + | 2 | × | 1 | X | = | 1 | X |
| 3 | + | 1 | X | − | 8 | X | X | + | 2 | X | = | 1 | X |
| 3 | + | 3 | X | − | 8 | X | X | = | 1 | X |
| X1= | - | 1 2 |
| X2= | 3 4 |