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f(x) = 2x+1
g(x) = (3x+1) / (4x-1)
(gof)(x) =
g(f(x)) =
[3(2x+1) +1] / [4(2x+1)-1] =
[6x+3+1] / [8x+4-1] =
[6x+4] / [8x+3]
jadi
(gof)(x) = (6x+4) / (8x+3)