$\left\{\begin{matrix}F=-\frac{x-11}{3Ix}\text{, }&x\neq 0\text{ and }I\neq 0\\F\in \mathrm{C}\text{, }&x=11\text{ and }I=0\end{matrix}\right.$

$\left\{\begin{matrix}I=-\frac{x-11}{3Fx}\text{, }&x\neq 0\text{ and }F\neq 0\\I\in \mathrm{C}\text{, }&x=11\text{ and }F=0\end{matrix}\right.$

$\left\{\begin{matrix}F=-\frac{x-11}{3Ix}\text{, }&x\neq 0\text{ and }I\neq 0\\F\in \mathrm{R}\text{, }&x=11\text{ and }I=0\end{matrix}\right.$

$\left\{\begin{matrix}I=-\frac{x-11}{3Fx}\text{, }&x\neq 0\text{ and }F\neq 0\\I\in \mathrm{R}\text{, }&x=11\text{ and }F=0\end{matrix}\right.$