(64x^3÷27a^-3)^-2/3
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(64 x^3%27 by a^ 3)^ -2/3
=(4^3x^ 33multiplied bya^ 3/3^ 3)^ -2/3
=4^-2 x^ -2. a^-2/3^-2
=9/16 x^2 a^ 2
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