$4n^2-8n-12$
$-3\left(4x+5\right)-15$
$\lim_{x\to3}\left(-\frac{x^2-x-6}{x-3}\right)$
$\frac{dy}{dx}=\frac{30}{x^7}-2+24x^7$
$\left(a-b\right)^2-\left(a-b\right)^4$
$1\:+\:-17\:+\:13\:+\:1$
$\left(-5x^6-2x^3\right)^2$
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