| 200 | ÷ | x | = | 300 | ÷ | ( | 5 | ÷ | 4 | × | x | + | 5 | ) |
| 方程两边同时乘以: | x | , | ( | 5 | ÷ | 4 | × | x | + | 5 | ) |
| 200 | ( | 5 | ÷ | 4 | × | x | + | 5 | ) | = | 300 | x |
| 200 | × | 5 | ÷ | 4 | × | x | + | 200 | × | 5 | = | 300 | x |
| 250 | x | + | 1000 | = | 300 | x |
| 250 | x | − | 300 | x | = | - | 1000 |
| - | 50 | x | = | - | 1000 |
| 1000 | = | 50 | x |
| 50 | x | = | 1000 |
| x | = | 1000 | ÷ | 50 |
| = | 1000 | × | 1 50 |
| = | 20 | × | 1 |
| x | = | 20 |