| 2 | ÷ | ( | X | + | 1 | ) | + | 3 | ÷ | ( | X | − | 1 | ) | = | 5 |
| 方程两边同时乘以: | ( | X | + | 1 | ) |
| 2 | + | 3 | ÷ | ( | X | − | 1 | ) | × | ( | X | + | 1 | ) | = | 5 | ( | X | + | 1 | ) |
| 2 | + | 3 | ÷ | ( | X | − | 1 | ) | × | X | + | 3 | ÷ | ( | X | − | 1 | ) | × | 1 | = | 5 | ( | X | + | 1 | ) |
| 2 | + | 3 | ÷ | ( | X | − | 1 | ) | × | X | + | 3 | ÷ | ( | X | − | 1 | ) | × | 1 | = | 5 | X | + | 5 | × | 1 |
| 2 | + | 3 | ÷ | ( | X | − | 1 | ) | × | X | + | 3 | ÷ | ( | X | − | 1 | ) | = | 5 | X | + | 5 |
| 方程两边同时乘以: | ( | X | − | 1 | ) |
| 2 | ( | X | − | 1 | ) | + | 3 | X | + | 3 | = | 5 | X | ( | X | − | 1 | ) | + | 5 | ( | X | − | 1 | ) |
| 2 | X | − | 2 | × | 1 | + | 3 | X | + | 3 | = | 5 | X | ( | X | − | 1 | ) | + | 5 | ( | X | − | 1 | ) |
| 2 | X | − | 2 | × | 1 | + | 3 | X | + | 3 | = | 5 | X | X | − | 5 | X | × | 1 | + | 5 | ( | X | − | 1 | ) |
| 2 | X | − | 2 | + | 3 | X | + | 3 | = | 5 | X | X | − | 5 | X | + | 5 | ( | X | − | 1 | ) |
| 5 | X | + | 1 | = | 5 | X | X | − | 5 | X | + | 5 | ( | X | − | 1 | ) |
| 5 | X | + | 1 | = | 5 | X | X | − | 5 | X | + | 5 | X | − | 5 | × | 1 |
| 5 | X | + | 1 | = | 5 | X | X | − | 5 | X | + | 5 | X | − | 5 |
| 5 | X | + | 1 | = | 5 | X | X | − | 0 | X | − | 5 |