Solve for K
K=VW\left(S-r\right)
W\neq 0\text{ and }S\neq r
Solve for S
\left\{\begin{matrix}S=\frac{VWr+K}{VW}\text{, }&K\neq 0\text{ and }W\neq 0\text{ and }V\neq 0\\S\neq r\text{, }&V=0\text{ and }K=0\text{ and }W\neq 0\end{matrix}\right.
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