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f(2) = 11
a.2 + 3 = 11
2a + 3= 11
2a = 11-3
2a = 8
a = 8:2
a = 4
f(2) = a(2) +3 = 11
= 2a +3 = 11
= 2a = 11 -3
= 2a = 8
= a = 8/2
= a = 4
Jadi, nilai a adalah 4.