\(\frac{x^3+y^3}{6}=\frac{x^3-2y^3}{4}\Leftrightarrow4x^3+4y^3=6x^3-12y^3\)
\(\Leftrightarrow4x^3+16y^3=6x^3\Leftrightarrow2x^3=16y^3\Leftrightarrow x^3=8y^3\Leftrightarrow x=2y\)
\(\Rightarrow x^6+y^6=65\left(y^6\right)=64\Leftrightarrow y^6=\frac{64}{65}\)
\(\Rightarrow y=\frac{\sqrt[6]{64}}{\sqrt[6]{65}}\Rightarrow x=\frac{2\sqrt[6]{64}}{\sqrt[6]{65}}\)