[tex]6x^3-2x^2-18x+6=0\\2x^2(3x-1)-6(3x-1)=0\\(2x^2-6)(3x-1)=0\\2(x^2-3)(3x-1)=0\\x^2-3=0\ \Rightarrow x_{1,2}=\pm\sqrt{3}\\3x-1=0\ \Rightarrow x_3=\frac{1}{3}\\\\x\in\{-\sqrt{3};\frac{1}{3};\sqrt{3}\}[/tex]
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