$5x+7y=15$
$x^2-x+50$
$\left(\sqrt{7}\:w+z^5\:\right)\left(\sqrt{7}\:w-z^5\:\right)$
$1.8+8.9$
$\frac{dy}{dx}=\frac{x-3}{y-3}$
$a^4+6a^2+9$
$x^2-4\le3x$
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