| 40000 | ÷ | x | ÷ | ( | 3 50 | + | 40000 | ÷ | x | ) | − | 1 4 | = | 0 |
| 方程两边同时乘以: | x |
| 40000 | ÷ | ( | 3 50 | + | 40000 | ÷ | x | ) | − | 1 4 | x | = | 0 |
| 方程两边同时乘以: | ( | 3 50 | + | 40000 | ÷ | x | ) |
| 40000 | − | 1 4 | x | ( | 3 50 | + | 40000 | ÷ | x | ) | = | 0 |
| 40000 | − | 1 4 | x | × | 3 50 | − | 1 4 | x | × | 40000 | ÷ | x | = | 0 |
| 40000 | − | 3 200 | x | − | 10000 | x | ÷ | x | = | 0 |
| - | 3 200 | x | = | 0 | − | 40000 | + | 10000 | × | 1 | ÷ | 1 |
| - | 3 200 | x | = | 0 | − | 40000 | + | 10000 |
| - | 3 200 | x | = | - | 30000 |
| 30000 | = | 3 200 | x |
3 200 | x | = | 30000 |
| x | = | 30000 | ÷ | 3 200 |
| = | 30000 | × | 200 3 |
| = | 10000 | × | 200 |
| x | = | 2000000 |