Posted by Jack on Monday, April 23, 2012 at 7:10pm.
f(x) = x - 1
g(x) = x + 1
f(g(x)) = g(x) - 1 = x + 1 - 1 = x
g(f(x)) = f(x) + 1 = x - 1 + 1 = x
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