$\frac{y^2-25}{y-5}$
$x^2-3xy^2+5x^2y-7xy^2+9x^2y$
$x-5>3-x$
$\frac{d}{dx}\left(x^2\sqrt{y}-\sqrt{x}y^2=25\right)$
$\left(18\:\cdot2000\right)\:+\:\left(24\:\cdot2160\right)$
$x\cdot200=-400$
$18x+5<705-52x$
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