是否存在m的值会使关于y的方程m（k- 3）y=2+（3a- m）y无解，若存在请求m的值，若不存在请说明理由.
The presence or absence of a value of m will make the equation m(k- 3)y=2+(3a- m)y unsolvable for y, and if there is a value of request m, please explain the reason if it does not exist.
