Since f(x)= f(3) or x = 3, therefore
f(x) = 2x + 7
f(3) = 2(3) + 7
f(3) = 6 + 7
f(3)= 13
Therefore the answer is 13
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Since f(x)= f(3) or x = 3, therefore
f(x) = 2x + 7
f(3) = 2(3) + 7
f(3) = 6 + 7
f(3)= 13
Therefore the answer is 13