$\frac{-4x^4+7x-8x^2-3}{5-x}$
$\lim_{x\to5}\left(\frac{\sqrt{x-1\:}}{x-5}-2\right)$
$16x^5-48x^2+36x$
$\left(7x^2y+5x\right)^2$
$6\left(3g-5\right)$
$b-5>-4$
$x-3\ge0$
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