$x-20<50$
$\frac{dy}{dx}=2y\left(1-y\right)-\frac{3}{8}$
$\left|-300\right|$
$16cd-14c+2cd-7$
$10u+5-u^2+7u^2-7u$
$\left(2x+20\right)^3$
$m^2+25+5$
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