$co\:5\:ca8\:\sec\left(50\right)$
$x^2-2x=6x-16$
$3-\left(-9\right)+8$
$\frac{x^{-5}.x^4}{x}$
$\frac{n^3-n^2-4n+4}{n^2-n-2}$
$\frac{x+3}{x^2+3x-4}$
$\left(3\left(5\right)+1\right)$
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