$\left(2a^2-5b^5\right)^2$
$\frac{a^3-a^2+2}{a+1}$
$23-\left(6-8\right)+\left(-2-3\right)+40$
$-5-x^2$
$\frac{4}{3}+2x<3$
$-x+7x-2+3x-5$
$\lim_{x\to0}\left(\frac{\sqrt{3x+5}-\sqrt{5}}{\sqrt{7}-\sqrt{7+2x}}\right)$
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