$\frac{-45x-2x+x^3}{x+7}$
$-5x^4y+y^2\frac{dy}{dx}=y$
$\left(2x+3y^2\right)^2\left(2x+3y^2\right)$
$\left(5x+5\right)^3$
$ay+ay$
$\frac{15x^5-11x^4+21x^3-x^2+3}{3x^2-x+2}$
$y=\left(\frac{1}{2}\right)^{-1}$
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