$7x^2-2x$
$\int\left(x^2+7x+5\right)\cos\left(2x\right)dx$
$\left(m+\frac{3}{2}n\right)\left(m-\frac{3}{2}n\right)$
$5b-1-3b$
$9x-4y\sqrt{x^2+1}\left(\frac{dy}{dx}\right)=0$
$3x^23-2x^22y^22+y^23-5$
$\frac{x-4}{2}=\frac{2x+1}{3}$
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