$20x^2-5x+2$
$\left(a-12m^2x^2\right)^2$
$18\sqrt{4}+47\sqrt{4}$
$\lim_{x\to-1}\left(2x-1\right)$
$25x+12x-31-8+5$
$\lim_{a\to0}\left(\frac{1}{a^{\frac{1}{3}}}\right)$
$7\sqrt{5}-2\sqrt{5}-\sqrt{5}$
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