$\frac{dy}{dx}-\frac{3y}{x}=x^4$
$4\tan^2\left(u\right)-1=\tan^2\left(u\right)$
$2x^3-x^2-1$
$3ab-7ab$
$4\frac{d^2u}{dy^2}-4\frac{du}{dy}+u=0$
$3b^2+2b-5$
$64x^3+343y^3$
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