Denoting ff as f2 etc,
f2 + f + f3 + f = f3 + f2 + 2f
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You just write that as "f + 6". You can't simplify that any more, unless you know how much "f" is.
To evaluate a formula is to try and solve or simplify it. For instance f(x) = 2x*4x-1x+6 f(x) = 7x+6 f(3) = 7*3+6
No, f(x) is not the inverse of f(x).
f(7) = -9.
h(x)=3x-4