| 50000 | ÷ | x | = | 45000 | ÷ | ( | x | − | 200 | ) |
| 方程两边同时乘以: | x | , | ( | x | − | 200 | ) |
| 50000 | ( | x | − | 200 | ) | = | 45000 | x |
| 50000 | x | − | 50000 | × | 200 | = | 45000 | x |
| 50000 | x | − | 10000000 | = | 45000 | x |
| 50000 | x | − | 45000 | x | = | 10000000 |
| 5000 | x | = | 10000000 |
| x | = | 10000000 | ÷ | 5000 |
| = | 10000000 | × | 1 5000 |
| = | 2000 | × | 1 |
| x | = | 2000 |