$\frac{64n^3+m^3}{4n+n}$
$1-5a+0-a^2-5+0$
$-\left(-14+15-9\right)-\left(-20-6+30\right)+\left(-6+10-3\right)$
$216\cdot4^3$
$3amn-5anm-4mn$
$\frac{dy}{dx}+\frac{2}{x}y=-x^2$
$\lim_{x\to0}\left(\frac{2x}{2x\sin\left(2x\right)+\sin\left(2x\right)}\right)\:$
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