(a) "\\frac{27x^{-3}y^2}{(3x^{-2}y^4)^2}=\\frac{27x^{-3}y^2}{9x^{-4}y^8}=\\frac{3x}{y^6}"
(b) "2^3x^2*2^4x=\\frac{2^2}{2^{-2}}"
"2^7x^3=2^4"
"x^3=\\frac{1}{2^3}"
"x=\\frac{1}{2}"
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