| 3000 | ÷ | x | + | 2000 | ÷ | ( | x | − | 5 | ) | = | 0 |
| 方程两边同时乘以: | x |
| 3000 | + | 2000 | ÷ | ( | x | − | 5 | ) | × | x | = | 0 |
| 方程两边同时乘以: | ( | x | − | 5 | ) |
| 3000 | ( | x | − | 5 | ) | + | 2000 | x | = | 0 |
| 3000 | x | − | 3000 | × | 5 | + | 2000 | x | = | 0 |
| 3000 | x | − | 15000 | + | 2000 | x | = | 0 |
| 5000 | x | − | 15000 | = | 0 |
| 5000 | x | = | 0 | + | 15000 |
| 5000 | x | = | 15000 |
| x | = | 15000 | ÷ | 5000 |
| = | 15000 | × | 1 5000 |
| = | 3 | × | 1 |
| x | = | 3 |