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(f o f)(x) = f(f(x))
= (3f(x) + 2)/(f(x) - 3)
= (3(3x + 2)/(x - 3) + 2)/((3x + 2)/(x - 3) - 3) kali dengan (x - 3)/(x - 3)
= (3(3x + 2) + 2(x - 3)) / ((3x + 2) - 3(x - 3))
= (9x + 6 + 2x - 6) / (3x + 2 - 3x + 9)
= (11x)/(11)
= x