$3m^2n+2mn-n:3mn-4n-4\:-3m^2n+5mn$
$\left(3.4^{17}\right)^4$
$\frac{dy}{dx}=\frac{x+3y}{2x}$
$\left(a+2\right)^2+\left(a-2\right)^2-2\left(a+3\right)^2$
$\left(-43\right)-\left(-19\right)$
$13x-21>5-x$
$\lim_{x\to0}\left(\frac{w^3-64w}{w^2+2w}\right)$
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