$2xy+3y-4y+4$
$4x-1-5\left(x-2\right)=0$
$4n^2-49$
$-5\cdot3+0\cdot2$
$\frac{p^{-1}}{p^{-4}}$
$\frac{dy}{dx}=\frac{y^2+1}{x^2+1},\:y\left(0\right)=1$
$\frac{x-9}{x^2+4x}$
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