$49x^2-20x+36$
$\frac{10xy^2}{5xy}$
$y-16-192$
$\left(3x^2y^3+4x^3y^5\right)^3$
$\lim_{x\to-\infty}\left(\frac{x-7}{x^2+6x-9}\right)$
$5x\:para\:x=2$
$\left(2m^6n^2\right)\left(-2m^6n^2\right)$
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