Ebatzi: K
\left\{\begin{matrix}K=N+\frac{N}{R}\text{, }&N\neq 0\text{ and }R\neq 0\\K\neq 0\text{, }&R=0\text{ and }N=0\end{matrix}\right.
Ebatzi: N
\left\{\begin{matrix}N=\frac{KR}{R+1}\text{, }&K\neq 0\text{ and }R\neq -1\\N\neq 0\text{, }&K=0\text{ and }R=-1\end{matrix}\right.
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