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g(x) = 3x + 120
g(f(x)) = f(g(x))
3(2x + p) + 120 = 2(3x + 120) + p
6x + 3p + 120 = 6x + 240 + p
6x + 3p + 120 - 6x - 240 - p = 0
2p - 120 = 0
2p = 120
p = 120/2
p = 60