$-\left(4x-5\right)-x=45$
$2=m+9$
$4\:+\:3\:x\:2\:-\:16$
$\lim_{z\to a}\left(\frac{x^2-a^2}{x^2+zax+a^2}\right)$
$\frac{dy}{dx}=y^{2\:}-y$
$256n^2+225m^2+480mn$
$2\left(x+1\right)\left(x-1\right)$
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