$4m^2-8mn-4m+8n$
$\frac{18}{m+1}=2$
$w^2+16w$
$y^{'\:}=\frac{-\left(3y^2+1\right)x}{x^2+1}$
$x^2+40x+25$
$-x^2-7x-30$
$\lim_{t\to\frac{3}{2}}\left(4t^2-9\right)$
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