$\lim_{x\to1}\left(\frac{3x}{x-1}\right)$
$4a-9b+\frac{4b^3}{a^2}-\frac{9a^3}{b^2}$
$\sqrt{200m^2}$
$5x\:+\:3\:>2x\:+\:9$
$\frac{2x^55}{x^2+1}$
$7d+4d$
$\sqrt[n]{ab}=\sqrt[n]{a}\sqrt[n]{b}$
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