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The function f(x) = 3x + 2 can take any real value, so the question does not seem to make any sense.
It depends on whether fx denotes frequency times variable value or the probability generating function for the variable x.
f(71.19) = 71 where int(x) is the integer value of a number
If you are talking about f(x) then yes it is the same as y
If x and f are quantities then xf and fx are the same if they belong to a commutative space. If not, they normally do not. Multiplication of matrices, for example is cont commutative. In fact, it is quite possible that xf has a value but fx does not even exist. if x and f are functions then again, fx and xf will not generally be the same. For example suppose x = "add 5 to it" and f = "square it". Then xf(3) = x(9) = 14 while fx(3) = f(8) = 64