(-128)¹/⁷-(4/7)*∛(5²³/₆₄)=((-2)⁷)¹/⁷-(4/7)*∛(343/64)=-2-(4/7)*∛(7³/4³)=-2-(4/7)*∛(7/4)³=
=-2-(4/7)*(7/4)=-2-1=-3.
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(-128)¹/⁷-(4/7)*∛(5²³/₆₄)=((-2)⁷)¹/⁷-(4/7)*∛(343/64)=-2-(4/7)*∛(7³/4³)=-2-(4/7)*∛(7/4)³=
=-2-(4/7)*(7/4)=-2-1=-3.