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Verified answer
(gof) = 1/(2x-1)g(x) = 2x -1 maka
g(f(x)) = 1/(2x-1)
2.f(x) - 1 = 1/(2x-1)
2.f(x) = 1/(2x-1) + 1
2.f(x) = 1/(2x-1) + (2x-1)/(2x-1) = 2x/(2x-1)
f(x) = x/(2x-1)