$7xy-21y^2$
$y'\:+\:\left(\frac{1}{t}\right)y\:=\:3\cos\left(t\right)$
$27-1$
$\frac{d}{dx}\:2x^6$
$\frac{\sin^2x}{\cos^2x}+1=\csc^2x$
$a-a+3a$
$\frac{dy}{dx}=\frac{y}{x-2y}$
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