$30-13c-c^2$
$15\cdot30$
$x+y\frac{dy}{dx}$
$\frac{3}{4+x}+30>\frac{2}{4+x}-20$
$x-1-x^2-3x+5-x^2+7x+12$
$c^9m^4\cdot c^3m^8$
$\lim_{x\to4}\left(\frac{3x^3+2x^2+x}{x}\right)$
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