$\frac{23mn^3}{17m^3n}$
$68\cdot69$
$3x+2<x\:+12$
$x^2-81x+81=0$
$\frac{dy}{dx}=-\frac{x^2+y^2}{2xy}$
$x^6-6x^3-7$
$36\cdot3^2-60\cdot3+25$
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