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1 = f(2x-5)
1=6(2x-5)^2 -5
1= 6(4x^2-20x+25) -5
1=24x^2 -120x + 150 -5
1=24x^2 -120x + 145
24x^2 - 120x + 144 = 0
------------------------------------ X 1/24
x^2 - 5x + 6 = 0
(x-6)(x+1) = 0
nilai x yg memenuhi, x = 6 atau x = -1
*x^2 = x pangkat 2