Solve for p
\left\{\begin{matrix}p\geq -\frac{2-3n}{n-4}\text{, }&n<-1\\p=-\frac{2-3n}{n-4}\text{, }&n\neq 4\text{ and }n\neq -1\\p\leq -\frac{2-3n}{n-4}\text{, }&n\neq 4\text{ and }n>-1\end{matrix}\right.
Solve for n
\left\{\begin{matrix}n=-\frac{2(1-2p)}{p-3}\text{, }&p\neq 1\text{ and }p\neq 3\\n>4\text{, }&p\leq 3\\n\in (4,-\frac{2(1-2p)}{p-3}]\text{, }&p>3\\n\in [-\frac{2(1-2p)}{p-3},-1)\text{, }&p>1\text{ and }p<3\\n<-1\text{, }&p\geq 3\\n\in (-1,-\frac{2(1-2p)}{p-3}]\text{, }&p<1\end{matrix}\right.
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