$\frac{21}{\sqrt{21}}$
$x+\sqrt{5x+19}=-1$
$\frac{d}{dx}\left(3x^3+2x^2+2x\right)$
$\frac{x^2-3x-2}{x+1}$
$2-8v^2$
$2^3y\:+\:6$
$3x^4-46x$
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