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f(g(x)) = 14
(2x-1)²-3(2x-1)+4 = 14
4x²-4x+1-6x+3 +4 -14 = 0
4x²-10x -6 = 0
(2x- 6) (2x+1)
jadi,
2x = 6 atau 2x = -1
x = 3 atau x = -1/2