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Verified answer
F(x)=x+3g(x)=5x-2
fog= (5x-2)+3 = 5x+1
y=5x+1
5x=y-1
x=y-1/5 (ubah x»y, y»x)
y=x-1/5
jadi (fog)^-1(x)= x-1/5