X^-4/3-x^-2/3-2^3=0 решите плизззз

[latex]x^{- \frac{4}{3}}-x^{ -\frac{2}{3}} -2^3=0; \\ x^{- \frac{4}{3}}-x^{ -\frac{2}{3}}=2^3; \\ x^{ -\frac{2}{3}}*(x^{- \frac{2}{3}}-1)=2^3; \\ x^{ -\frac{2}{3}}=2^3; \\ \sqrt[-3]{x^2}=2^3; \\ x^2= \frac{1}{2^9}; \\ x_1= \frac{1}{ \sqrt{512} }; \\ (x^{- \frac{2}{3}}-1)=2^3; \\ x^{- \frac{2}{3}}=7; \\ x_2= \frac{1}{ \sqrt{343}}; [/latex]