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\left\{\begin{matrix}a=\frac{\sqrt{-Сx-16x^{2}+2\sqrt{5}x}}{x}+2\text{; }a=-\frac{\sqrt{-Сx-16x^{2}+2\sqrt{5}x}}{x}+2\text{, }&\left(С\neq -\frac{\sqrt{5}}{8}\text{ and }x=\frac{\sqrt{5}}{8}+С_{1}\right)\text{ or }\left(x\geq \frac{\sqrt{5}}{8}+С_{2}\text{ and }x<0\right)\text{ or }\left(x>0\text{ and }x\leq \frac{\sqrt{5}}{8}+С_{3}\right)\\a\in \mathrm{R}\text{, }&С=2\sqrt{5}\text{ and }x=0\end{matrix}\right.
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