$-\:7\:\left(m-n-\:2\right)-3\left(-m+n-8\right)$
$\frac{dy}{dx}=\frac{y}{x}+4x^2$
$\left(m\:-\:3\:\right)\left(m\:+\:2\right)$
$\left(12x-11\right)\left(12x+11\right)$
$-200+797$
$\left(6-7+9-2\right)^2-\left(6-4\right)^2$
$\left(a+1\right)\left(a-1\right)-2a+2$
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