$\lim_{x\to0}x$
$\frac{2x-3}{x+1}>1$
$1-\left(20+15\right)$
$\lim_{x\to1}\left(-\frac{1}{\left(x-1\right)}\right)$
$\frac{a^8}{b^3}^6$
$\sqrt{4x^3+6}$
$6x+21x$
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