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Verified answer
f(x) = 4x - 5f(2x + 1) = 4(2x + 1) - 5
= 8x + 4 - 5
= 8x - 1
f(x) = f(2x + 1)
4x - 5 = 8x - 1
1 - 5 = 8x - 4x
-4 = 4x
-1 = x