$\left(\frac{x^4y^{-3}}{x^{-5}y^8}\right)$
$x^3y^2x^{-2}y^{-3}$
$\left(\frac{\left(\left(x^2\right)^{-6}x^3\right)}{x^{-4}}\right)^{-1}$
$4x^6-81$
$\left(4x^4+3\right)^3$
$x-2\left(2x^2-x+5\right)$
$\lim_{x\to0}\left(\frac{2e^{2x}}{x^3}\right)$
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