$x^2+81x+80=0$
$6^6\:x\:6^{-2}$
$\frac{x}{3}-11\ge\frac{7y}{5}-9x$
$\frac{d}{dx}lnx+lny\:=\:7x+7y$
$\lim_{x\to0}\left(\frac{4cos\left(-0.1\right)-4}{-0.1}\right)$
$-3\left(g+9\right)$
$4a^2+2ab$
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