$-4x\ge-24$
$\frac{8x^5y}{4xy}$
$\lim_{x\to4}\left(\frac{4x}{x^2}\right)$
$-2z^2+4z+2z^2$
$\lim_{x\to3}\left(7x^2-8x\right)$
$15xy^2+6x^2y^2$
$x^2\:+\:28x\:+\:196\:=\:$
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