$\frac{s^3-1}{s-1}$
$x^2+14=18$
$\left(9x+5x^2-2\right):\left(5x-1\right)$
$2e^{2\infty}$
$\frac{d^2}{dx^2}=x^2e^{xy}$
$ac+2bc-ad-2bd$
$\frac{2}{-y}dy=dx$
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