$-12\:=\:12\:$
$\left(-7-2x\right)^2$
$10x^6-5x^5+20x^4+30x^2$
$2ydy=xe^xdx$
$2\cdot7-4$
$\frac{a^5}{a^8}$
$\lim_{x\to3}\left(\sqrt{x^2-9}\right)$
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