f(x + 2) = 85 - x
x + 2 = 4
x = 2
f(4) = f(2 + 2) = 85 - 2 = 83
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f(x + 2) = 85 - x
x + 2 = 4
x = 2
f(4) = f(2 + 2) = 85 - 2 = 83