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