Gjej y
\left\{\begin{matrix}y=\frac{x\left(-\sqrt{1+84x-36x^{2}}+7\right)}{6\left(x-1\right)}\text{; }y=\frac{x\left(\sqrt{1+84x-36x^{2}}+7\right)}{6\left(x-1\right)}\text{, }&x\neq 0\text{ and }x\neq 1\text{ and }x\geq \frac{7-5\sqrt{2}}{6}\text{ and }x\leq \frac{5\sqrt{2}+7}{6}\\y=-\frac{1}{7}\approx -0.142857143\text{, }&x=1\end{matrix}\right.
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