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g(f(x)) = 2x²-6x+1
2(f(x))+5 = 2x²-6x+1
2(f(x)) = 2x²-6x+1-5
2(f(x)) = 2x²-6x-4
f(x) = 2x²-6x-4
2
f(x) = x²-3x-2