Solve for R_12
\left\{\begin{matrix}R_{12}\in \left(R_{11},\infty\right)\cup \left(-\infty,0\right)\text{, }&R_{11}>0\\R_{12}\neq 0\text{, }&R_{11}=0\\R_{12}\in \left(0,\infty\right)\cup \left(-\infty,R_{11}\right)\text{, }&R_{11}<0\end{matrix}\right.
Solve for R_11
\left\{\begin{matrix}R_{11}>R_{12}\text{, }&R_{12}<0\\R_{11}<R_{12}\text{, }&R_{12}>0\end{matrix}\right.
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