| ( | 10 | − | x | ) | ÷ | 1 2 | = | 439 2000 | × | 1391 2500 | x | ÷ | ( | 1 | + | 1391 2500 | x | ) |
| 方程两边同时乘以: | ( | 1 | + | 1391 2500 | x | ) |
| ( | 10 | − | x | ) | ÷ | 1 2 | × | ( | 1 | + | 1391 2500 | x | ) | = | 439 2000 | × | 1391 2500 | x |
| 10 | ÷ | 1 2 | × | ( | 1 | + | 1391 2500 | x | ) | − | x | ÷ | 1 2 | × | ( | 1 | + | 1391 2500 | x | ) | = | 439 2000 | × | 1391 2500 | x |
| 20 | ( | 1 | + | 1391 2500 | x | ) | − | x | × | 2 | ( | 1 | + | 1391 2500 | x | ) | = | 610649 5000000 | x |
| 20 | × | 1 | + | 20 | × | 1391 2500 | x | − | x | × | 2 | ( | 1 | + | 1391 2500 | x | ) | = | 610649 5000000 | x |
| 20 | + | 1391 125 | x | − | x | × | 2 | ( | 1 | + | 1391 2500 | x | ) | = | 610649 5000000 | x |
| 20 | + | 1391 125 | x | − | x | × | 2 | × | 1 | − | x | × | 2 | × | 1391 2500 | x | = | 610649 5000000 | x |
| 20 | + | 1391 125 | x | − | x | × | 2 | − | x | × | 1391 1250 | x | = | 610649 5000000 | x |
| 20 | + | 1141 125 | x | − | x | × | 1391 1250 | x | = | 610649 5000000 | x |