It means: 3 times n
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The GCF is 3n.
25-3n = 22
(9n2 - 121) = (3n + 11) (3n - 11)
Well, darling, 3n - 18 is an algebraic expression where you take three times a number (n) and then subtract 18 from it. It's as simple as that. So, if you want to find the value of this expression, you'll need to know the value of n. Hope that clears things up for you, sugar.