| 4000 | ÷ | x | − | 4000 | ÷ | 6 5 | ÷ | x | = | 300 |
| 方程两边同时乘以: | x |
| 4000 | − | 4000 | ÷ | 6 5 | ÷ | 1 | × | 1 | = | 300 | x |
| - | 300 | x | = | - | 4000 | + | 4000 | ÷ | 6 5 | ÷ | 1 | × | 1 |
| - | 300 | x | = | - | 4000 | + | 10000 3 |
| - | 300 | x | = | - | 2000 3 |
2000 3 | = | 300 | x |
| 300 | x | = | 2000 3 |
| x | = | 2000 3 | ÷ | 300 |
| = | 2000 3 | × | 1 300 |
| = | 20 3 | × | 1 3 |
| x | = | 20 9 |
| x | = | 2.222222 |