Solve for l (complex solution)
\left\{\begin{matrix}l=\frac{2\left(x^{2}+S\right)}{x}\text{, }&x\neq 0\\l\in \mathrm{C}\text{, }&S=0\text{ and }x=0\end{matrix}\right.
Solve for S
S=\frac{x\left(l-2x\right)}{2}
Solve for l
\left\{\begin{matrix}l=\frac{2\left(x^{2}+S\right)}{x}\text{, }&x\neq 0\\l\in \mathrm{R}\text{, }&S=0\text{ and }x=0\end{matrix}\right.
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