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f(2a+1) = 5.(2a+1) - 9
= 10a + 5 - 9
= 10a - 4
f(3) = 5x - 9
= 5.3 - 9
= 15 - 9
= 6
f(2a+1)+f(3) = 10a -4 + 6
= 10a + 2