| ( | 20 | − | x | ) | ÷ | ( | 2511 125 | − | x | ) | = | ( | 20 | + | x | ) | ÷ | ( | 20039 1000 | + | x | ) |
| 方程两边同时乘以: | ( | 2511 125 | − | x | ) | , | ( | 20039 1000 | + | x | ) |
| ( | 20 | − | x | ) | ( | 20039 1000 | + | x | ) | = | ( | 20 | + | x | ) | ( | 2511 125 | − | x | ) |
| 20 | ( | 20039 1000 | + | x | ) | − | x | ( | 20039 1000 | + | x | ) | = | ( | 20 | + | x | ) | ( | 2511 125 | − | x | ) |
| 20 | ( | 20039 1000 | + | x | ) | − | x | ( | 20039 1000 | + | x | ) | = | 20 | ( | 2511 125 | − | x | ) | + | x | ( | 2511 125 | − | x | ) |
| 20 | × | 20039 1000 | + | 20 | x | − | x | ( | 20039 1000 | + | x | ) | = | 20 | ( | 2511 125 | − | x | ) | + | x | ( | 2511 125 | − | x | ) |
| 20 | × | 20039 1000 | + | 20 | x | − | x | ( | 20039 1000 | + | x | ) | = | 20 | × | 2511 125 | − | 20 | x | + | x | ( | 2511 125 | − | x | ) |
20039 50 | + | 20 | x | − | x | ( | 20039 1000 | + | x | ) | = | 10044 25 | − | 20 | x | + | x | ( | 2511 125 | − | x | ) |
20039 50 | + | 20 | x | − | x | × | 20039 1000 | − | x | x | = | 10044 25 | − | 20 | x | + | x | ( | 2511 125 | − | x | ) |
20039 50 | + | 20 | x | − | x | × | 20039 1000 | − | x | x | = | 10044 25 | − | 20 | x | + | x | × | 2511 125 | − | x | x |
20039 50 | − | 39 1000 | x | − | x | x | = | 10044 25 | + | 11 125 | x | − | x | x |
| x1= | - | √59544919 1000 |