f(g(x)) does NOT result in the same equation as g(f(x))
It can happen in some cases, but in general it is not true.
For example:
f(x) = x^2
g(x) = x + 1
Then f(g(x)) = (x + 1)^2
and g(f(x)) = x^2 + 1
(x + 1)^2 is different to x^2 + 1
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