(8a^-5 b^4 c^-2 / 2 a^6 b^-3 c^-4)^-3

=(4a^-5a^-6 x b^4 b^3x c^-2 c^4)^-3

=(4(a^-11)b^7 c^2 )^-3

=4^-3 a^-33 b^-21 c^-6

is the answer right

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