Solve for F
F=-\frac{s\left(n-M\right)}{n+M}
M\neq -n
Solve for M
\left\{\begin{matrix}M=\frac{n\left(s+F\right)}{s-F}\text{, }&s\neq 0\text{ and }n\neq 0\text{ and }F\neq s\\M\neq 0\text{, }&n=0\text{ and }s=F\text{ and }F\neq 0\\M\neq -n\text{, }&F=0\text{ and }s=0\end{matrix}\right.
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