$x-y=3ehnwx\text{ and }ehnwx=0$

$\left\{\begin{matrix}x=0\text{, }&y=0\\x=y\text{, }&\left(y\neq 0\text{ and }h\neq 0\text{ and }w\neq 0\text{ and }n=0\right)\text{ or }h=0\text{ or }w=0\end{matrix}\right.$

$\left\{\begin{matrix}y=0\text{, }&x=0\\y=x\text{, }&\left(x\neq 0\text{ and }h\neq 0\text{ and }w\neq 0\text{ and }n=0\right)\text{ or }h=0\text{ or }w=0\end{matrix}\right.$