| ( | 50 | + | 100 | x | ) | ( | 1 | + | 2 | ÷ | x | ) | = | 0 |
| 50 | ( | 1 | + | 2 | ÷ | x | ) | + | 100 | x | ( | 1 | + | 2 | ÷ | x | ) | = | 0 |
| 50 | × | 1 | + | 50 | × | 2 | ÷ | x | + | 100 | x | ( | 1 | + | 2 | ÷ | x | ) | = | 0 |
| 50 | + | 100 | ÷ | x | + | 100 | x | ( | 1 | + | 2 | ÷ | x | ) | = | 0 |
| 方程两边同时乘以: | x |
| 50 | x | + | 100 | + | 100 | x | ( | 1 | + | 2 | ÷ | x | ) | x | = | 0 |
| 50 | x | + | 100 | + | 100 | x | × | 1 | x | + | 100 | x | × | 2 | ÷ | x | × | x | = | 0 |
| 50 | x | + | 100 | + | 100 | x | x | + | 200 | x | ÷ | x | × | x | = | 0 |
| x2= | - | 1 2 |