$3-\left(-24\right)-\left(+18\right)+7$
$\sqrt{1^2}2^2$
$a^2-0a+12$
$\lim_{x\to0}\left(\frac{e^x-\left(1-20x\right)}{x}\right)$
$\int\frac{1}{2x\sqrt{x^2+4}}dx$
$\frac{x^2-\frac{1}{2}x-6}{x+2}$
$81w^2-18w-1$
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