$7a-4b+a-3b-8a+7b$
$4x^2+16+16$
$\left(-18\right)^3$
$\frac{d}{dx}\left(y^k\right)$
$\frac{d}{dx}\:y=x+1$
$\lim_{x\to4}\left(\frac{\sqrt[3]{3x+31}}{x^2+2x-24}\right)$
$10-2\left(x-6\right)<4+x$
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