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y = 3x+120
3x = y-120
x =
g(f(x)) = 2x+p
3 f(x) + 120 = 2x+p
3 f(x) = 2x+p-120 .. pers 1
f(g(x)) = 2x+p
f(x) = 2 (x)+p
= 2 +p
= +p .. pers 2
subtitusikan pers 2 ke 1
3 [ +p ] = 2x+p-120
2x-240 +3p = 2x+p-120
3p-p = -120+240
2p = 120
p = 60
silahkan di re-check prosesnya sebelum menjadi jawaban akhir
semoga membantu