Answer
$e^{20}/81c^{12}$
Work Step by Step
$(3c^3/e^5)^{-4}$
$(e^5/3c^3)^4$
$e^{5*4}/3^4*(c^3)^4$
$e^{20}/81c^{3*4}$
$e^{20}/81c^{12}$
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