$\left\{\begin{matrix}L=\frac{l}{M}\text{, }&M\neq 0\\L\in \mathrm{C}\text{, }&l=0\text{ and }M=0\end{matrix}\right.$

$\left\{\begin{matrix}M=\frac{l}{L}\text{, }&L\neq 0\\M\in \mathrm{C}\text{, }&l=0\text{ and }L=0\end{matrix}\right.$

$\left\{\begin{matrix}L=\frac{l}{M}\text{, }&M\neq 0\\L\in \mathrm{R}\text{, }&l=0\text{ and }M=0\end{matrix}\right.$

$\left\{\begin{matrix}M=\frac{l}{L}\text{, }&L\neq 0\\M\in \mathrm{R}\text{, }&l=0\text{ and }L=0\end{matrix}\right.$