| 2 | ÷ | x | + | 1 | ÷ | ( | x | + | 20 | ) | = | 1 | ÷ | ( | x | + | 2 | ) |
| 方程两边同时乘以: | x | , | ( | x | + | 2 | ) |
| 2 | ( | x | + | 2 | ) | + | 1 | ÷ | ( | x | + | 20 | ) | × | x | ( | x | + | 2 | ) | = | 1 | x |
| 2 | x | + | 2 | × | 2 | + | 1 | ÷ | ( | x | + | 20 | ) | × | x | ( | x | + | 2 | ) | = | 1 | x |
| 2 | x | + | 4 | + | 1 | ÷ | ( | x | + | 20 | ) | × | x | ( | x | + | 2 | ) | = | 1 | x |
| 方程两边同时乘以: | ( | x | + | 20 | ) |
| 2 | x | ( | x | + | 20 | ) | + | 4 | ( | x | + | 20 | ) | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | ( | x | + | 20 | ) |
| 2 | x | x | + | 2 | x | × | 20 | + | 4 | ( | x | + | 20 | ) | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | ( | x | + | 20 | ) |
| 2 | x | x | + | 2 | x | × | 20 | + | 4 | ( | x | + | 20 | ) | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | x | + | 1 | x | × | 20 |
| 2 | x | x | + | 40 | x | + | 4 | ( | x | + | 20 | ) | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | x | + | 20 | x |
| 2 | x | x | + | 40 | x | + | 4 | x | + | 4 | × | 20 | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | x | + | 20 | x |
| 2 | x | x | + | 40 | x | + | 4 | x | + | 80 | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | x | + | 20 | x |
| 2 | x | x | + | 44 | x | + | 80 | + | 1 | x | ( | x | + | 2 | ) | = | 1 | x | x | + | 20 | x |
| 2 | x | x | + | 44 | x | + | 80 | + | 1 | x | x | + | 1 | x | × | 2 | = | 1 | x | x | + | 20 | x |
| 2 | x | x | + | 44 | x | + | 80 | + | 1 | x | x | + | 2 | x | = | 1 | x | x | + | 20 | x |
| 2 | x | x | + | 46 | x | + | 80 | + | 1 | x | x | = | 1 | x | x | + | 20 | x |