$100\cdot\left|-4-2\right|$
$\lim_{x\to-5}\left(\frac{x^4-625}{x+5}\right)$
$6\left(\frac{x+1}{8}\right)-\left(\frac{2x-3}{16}\right)$
$x^2+x+.25$
$\sqrt{8x^3}y^2$
$81x^2-16^6b^4$
$9a^4\:-\:25b^6$
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