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f(g(x)) = g(x) + 2
----------------------------
f(g(x)) = x^2 + 9x + 12
g(x) + 2 = x^2 + 9x + 12
g(x) = x^2 + 9x + 10
f(g(x)) = g(x) + 2
f(g(x)) = x^2 + 9x + 12
g(x) + 2 = x^2 + 9x + 12
g(x) = x^2 + 9x + 10