$2-\left(7-5+8\right)-\left(3-\left(2+7-1\right)+3\right)$
$\lim_{x\to5}\left(x^4+8x^3+2x^2\right)$
$3+2x=3\left(x-6\right)$
$\frac{dy}{dx}=\frac{x-1}{\sqrt{x+1}}$
$\frac{-48}{-8}+\frac{18}{-6}$
$2-4\left(5n+1\right)$
$\frac{t}{-5}+25=-15$
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