$x^2-9>0$
$30+29+28+27+26+25+25+25+24+23+22+22+21$
$6\:\cdot\:-9\:+\:5\:-18$
$\left(\frac{3uv^{-2}}{w^{-2}}\right)^3\left(v^3w^{-1}\right)$
$\frac{dy}{dx}=7xy^2$
$8x\:-\:15\:>\:x^2$
$2y^2+3xy=0$
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