| ( | 1 100 | − | x | ) | ÷ | ( | 149 25 | + | x | ) | × | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | x | = | 21000000000000 |
| 方程两边同时乘以: | ( | 149 25 | + | x | ) |
| ( | 1 100 | − | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | x | = | 21000000000000 | ( | 149 25 | + | x | ) |
1 100 | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | x | − | x | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | x | = | 21000000000000 | ( | 149 25 | + | x | ) |
1 100 | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | x | − | x | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | ( | 149 25 | + | x | ) | x | = | 21000000000000 | × | 149 25 | + | 21000000000000 | x |