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f((2x - 1 + 1)/2) = 6 . (x + 1)/2 + 5
f(x) = 3(x + 1) + 5
f(x) = 3x + 3 + 5
f(x) = 3x + 8
f(4) = 3(4) + 8
f(4) = 12 + 8
f(4) = 20