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g(x) = x+5
gof(x) = g(f(x))
= x+5
=(x+3/x-1)+5
=(x²-x+3/x-1)+5
=(x+3/x-1)+5
=x+3+5x-5/x-1
=6x-2/x-1
gof(3) = 6(3)-2/3-1
= 18-2/2
= 16/2
=8
semoga membantu :)