$\left(18\:\cdot2160\right)\:+\:\left(24\:\cdot2000\right)$
$2x-y+2z=-8$
$\frac{dy}{dx}\left(x^3-3x^2y=12\right)$
$-4x+x-\left(-3\right)$
$6v^{2\:\:\:\:}+\:v\:+\:15\:$
$\left(3a^2-3b^2\right)^2$
$4\sin u\cos^2-\sin u=0$
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