| 1 | ÷ | ( | x | + | 5 | ) | + | 1 | ÷ | ( | x | + | 20 | ) | = | 1 | ÷ | x |
| 方程两边同时乘以: | ( | x | + | 5 | ) | , | x |
| 1 | x | + | 1 | ÷ | ( | x | + | 20 | ) | × | ( | x | + | 5 | ) | x | = | 1 | ( | x | + | 5 | ) |
| 1 | x | + | 1 | ÷ | ( | x | + | 20 | ) | × | x | x | + | 1 | ÷ | ( | x | + | 20 | ) | × | 5 | x | = | 1 | ( | x | + | 5 | ) |
| 1 | x | + | 1 | ÷ | ( | x | + | 20 | ) | × | x | x | + | 1 | ÷ | ( | x | + | 20 | ) | × | 5 | x | = | 1 | x | + | 1 | × | 5 |
| 1 | x | + | 1 | ÷ | ( | x | + | 20 | ) | × | x | x | + | 5 | ÷ | ( | x | + | 20 | ) | × | x | = | 1 | x | + | 5 |
| 方程两边同时乘以: | ( | x | + | 20 | ) |
| 1 | x | ( | x | + | 20 | ) | + | 1 | x | x | + | 5 | x | = | 1 | x | ( | x | + | 20 | ) | + | 5 | ( | x | + | 20 | ) |
| 1 | x | x | + | 1 | x | × | 20 | + | 1 | x | x | + | 5 | x | = | 1 | x | ( | x | + | 20 | ) | + | 5 | ( | x | + | 20 | ) |
| 1 | x | x | + | 1 | x | × | 20 | + | 1 | x | x | + | 5 | x | = | 1 | x | x | + | 1 | x | × | 20 | + | 5 | ( | x | + | 20 | ) |
| 1 | x | x | + | 20 | x | + | 1 | x | x | + | 5 | x | = | 1 | x | x | + | 20 | x | + | 5 | ( | x | + | 20 | ) |
| 1 | x | x | + | 25 | x | + | 1 | x | x | = | 1 | x | x | + | 20 | x | + | 5 | ( | x | + | 20 | ) |
| 1 | x | x | + | 25 | x | + | 1 | x | x | = | 1 | x | x | + | 20 | x | + | 5 | x | + | 5 | × | 20 |
| 1 | x | x | + | 25 | x | + | 1 | x | x | = | 1 | x | x | + | 20 | x | + | 5 | x | + | 100 |
| 1 | x | x | + | 25 | x | + | 1 | x | x | = | 1 | x | x | + | 25 | x | + | 100 |