$\left(\frac{9}{n}\right)\left(\frac{n\left(n+1\right)}{2}\right)$
$2\cdot x+6-x$
$\frac{dy}{dx}=\:2x-y$
$25\cdot8$
$\frac{dy}{dx}=4xy^2-4x+3y^2-3$
$4a^3w+20a^2w^2+25aw^3$
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