4x - 5
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5+4x
' N ' is the number. 5 less than it is (N - 5).
3l - 5 is an expression for five less than three times the length l
The question is ambiguous and the two possible answers are: Twelve times (a number and 5 times the number) = 12*(n + 5n) = 12*6n = 72n Twelve times a number amd five times the number = 12*n + 5*n = 17*n
5*B = 95