| 20 | = | ( | 1 | + | 11 10 | ÷ | ( | x | − | 1 20 | ) | ) | ÷ | ( | 1 | + | x | ) |
| 方程两边同时乘以: | ( | 1 | + | x | ) |
| 20 | ( | 1 | + | x | ) | = | ( | 1 | + | 11 10 | ÷ | ( | x | − | 1 20 | ) | ) |
| 20 | × | 1 | + | 20 | x | = | ( | 1 | + | 11 10 | ÷ | ( | x | − | 1 20 | ) | ) |
| 20 | × | 1 | + | 20 | x | = | 1 | + | 11 10 | ÷ | ( | x | − | 1 20 | ) |
| 20 | + | 20 | x | = | 1 | + | 11 10 | ÷ | ( | x | − | 1 20 | ) |
| 方程两边同时乘以: | ( | x | − | 1 20 | ) |
| 20 | ( | x | − | 1 20 | ) | + | 20 | x | ( | x | − | 1 20 | ) | = | 1 | ( | x | − | 1 20 | ) | + | 11 10 |
| 20 | x | − | 20 | × | 1 20 | + | 20 | x | ( | x | − | 1 20 | ) | = | 1 | ( | x | − | 1 20 | ) | + | 11 10 |
| 20 | x | − | 20 | × | 1 20 | + | 20 | x | ( | x | − | 1 20 | ) | = | 1 | x | − | 1 | × | 1 20 | + | 11 10 |
| 20 | x | − | 1 | + | 20 | x | ( | x | − | 1 20 | ) | = | 1 | x | − | 1 20 | + | 11 10 |
| 20 | x | − | 1 | + | 20 | x | ( | x | − | 1 20 | ) | = | 1 | x | + | 21 20 |
| 20 | x | − | 1 | + | 20 | x | x | − | 20 | x | × | 1 20 | = | 1 | x | + | 21 20 |
| 20 | x | − | 1 | + | 20 | x | x | − | 1 | x | = | 1 | x | + | 21 20 |
| 19 | x | − | 1 | + | 20 | x | x | = | 1 | x | + | 21 20 |