Jawabanmu

2014-03-05T19:46:51+07:00
F(g(x)) = g(f(x))
2(3x + 120) + p = 3(2x + p) + 120
6x + 240 + p = 6x + 3p + 120
6x - 6x + p - 3p = 120 - 240
-2p = -120
p = -120/(-2)
p = 60