| 100000 | ÷ | ( | x | + | 1 | ) | + | 1000 | = | 120000 | ÷ | x |
| 方程两边同时乘以: | ( | x | + | 1 | ) | , | x |
| 100000 | x | + | 1000 | ( | x | + | 1 | ) | x | = | 120000 | ( | x | + | 1 | ) |
| 100000 | x | + | 1000 | x | x | + | 1000 | × | 1 | x | = | 120000 | ( | x | + | 1 | ) |
| 100000 | x | + | 1000 | x | x | + | 1000 | × | 1 | x | = | 120000 | x | + | 120000 | × | 1 |
| 100000 | x | + | 1000 | x | x | + | 1000 | x | = | 120000 | x | + | 120000 |
| 101000 | x | + | 1000 | x | x | = | 120000 | x | + | 120000 |