$\lim_{x\to-\infty}\left(x+\sqrt{x^2+7x-2}\right)$
$\left(2a+3b-4\right)\left(2a-5b+2\right)$
$14xy+14xy$
$\left(20+x\right)\frac{dy}{dx}=6y$
$-48<-6c$
$16b^2+24bc+9c^2$
$5x+20$
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