$9+5+4$
$n^2-9$
$x^2+6x+c=13+c$
$\frac{d}{dx}\left(cos\:y^2\right)$
$x+5=-14$
$0.5\left(x-9\right)+16$
$\log5\left(4-x\right)-2\log5\left(x\right)$
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