$4a-4b-xb+xa$
$a^2+\frac{-a b^2}{a}$
$-3\cdot x^2+3x+9$
$\frac{dy}{dx}+2y=cos\left(3x\right)$
$2x^2y^2-6x^3y-4x^2y^3$
$\frac{x^2-4}{x-1}$
$4ydx+xdy=0$
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