| 2000 | ÷ | X | − | 200 | = | 5 4 | X | × | 2000 | ÷ | X |
| 方程两边同时乘以: | X |
| 2000 | − | 200 | X | = | 5 4 | × | 1 | × | 2000 | ÷ | 1 | × | X |
| - | 200 | X | − | 5 4 | × | 1 | × | 2000 | ÷ | 1 | × | X | = | - | 2000 |
| - | 200 | X | − | 2500 | X | = | - | 2000 |
| - | 2700 | X | = | - | 2000 |
| 2000 | = | 2700 | X |
| 2700 | X | = | 2000 |
| X | = | 2000 | ÷ | 2700 |
| = | 2000 | × | 1 2700 |
| = | 20 | × | 1 27 |
| X | = | 20 27 |
| X | = | 0.740741 |