$49b+21$
$3x^2-39+126$
$\frac{dy}{dx}\left(x^3\tan\left(x\right)-\sqrt{x}\right)$
$\frac{2x^3+4y^3}{xy}$
$20x+4=4$
$\left(2x+7\right)^3+31=4$
$\frac{9}{6}n^2-\frac{3}{2}n+1$
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