$\left(+4\right)-48$
$\left(9m+18y\right)^2$
$\lim_{x\to-4}\left(\frac{2x^2+5x-12}{x+4}\right)$
$64x^2-160y+100y^2$
$\int\frac{x+5}{x^2+10x+26}dx$
$\frac{dy}{dx}=x^8y^{-3}$
$x^2\:+6x+9=0$
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