$\lim_{x\to9}\left(\frac{9-x}{3-\sqrt{3}}\right)$
$\left(\frac{2}{3}x+x^2\right)^2$
$9-8+7-9+7-9+4-5+6-1$
$4+5-6+t$
$20x-14>0$
$2\sin x-\sqrt{3}=0$
$\frac{-5x^4}{-5x^4}$
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