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g(x) = 3x - 4
(f○g)^-1 (x)
= g`¹Of`¹
= g`¹ ( x+1 / 2x-1 )
= 3 ( x+1 / 2x-1 ) - 4
= 3x+3 / 2x-1 -4
= 3x+3 / 2x-1 -4(2x-1) / 2x-1
= 3x+3 / 2x-1 -6x+4/2x-1
= -3x+7 / 2x-1
itu hasilnya