$30\:-\:\left(-2\right)$
$x^2-4x+5>0$
$\frac{x-3}{x^2-3x}$
$\left(-2w^2+4zxy\right)^3$
$\frac{dy}{dx}\:x=e^y+e^{2y}$
$\frac{8x\sqrt{12}}{2}$
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