$\frac{x^{-9}x^4}{x^{-5}}$
$729a^{12}\:+\:243b^{18}$
$k^2-5k-4$
$\left[55\:+\:\left(-120\right)\right]\cdot3\:-\:\left(85\:-\:\left(-120\right)\right)$
$\left(7m-2\right)^2$
$x-3y+2=4$
$\lim_{x\to-1}\frac{1+p^9}{1+p^{15}}$
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