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13-n=9. i think.
The question is ambiguous so the answer is one of:3/n - 5 or 3/(n-5)
"n divided into 3" = 3/n
18-(3*d) or 18-3d
3n is the simplest, but you could also write it as 3*n or 3.n or 3xn. The problem with the last form is that it could represent the product of 3 and x and n.