$-\left(12-9\right)\cdot\left(8\cdot18\right)$
$\sqrt{\sqrt{81}}+125^{\frac{1}{3}}-8^{-0.3}+81^{-0.5}$
$-5x+7>-10x-8$
$\log_x\left(x^2y\right)$
$x^{4}y+2xy^{4}-3x^{4}y+5xy^{4}-x^{2}y$
$\lim_{x\to\infty}\left(\frac{2x^5+5x^2}{x^2+2x^5}\right)$
$x+y+z=11\:$
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