Solve for f
\left\{\begin{matrix}f=-\frac{1}{18}+\frac{С}{18x^{2}}+\frac{5}{2x}\text{, }&x\neq 0\\f\in \mathrm{R}\text{, }&С=0\text{ and }x=0\end{matrix}\right.
Solve for x
\left\{\begin{matrix}x=\frac{9\left(2\sqrt{С\left(f+1\right)}+5\right)}{2\left(9f+1\right)}\text{; }x=\frac{9\left(-2\sqrt{С\left(f+1\right)}+5\right)}{2\left(9f+1\right)}\text{, }&\left(f\leq -1\text{ and }С\leq 0\right)\text{ or }\left(f\neq -\frac{1}{9}\text{ and }С_{1}\geq 0\text{ and }f\geq -1\right)\\x=С\text{, }&f=-\frac{1}{9}\end{matrix}\right.
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