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f(3) ⇨ a.3 + 5 = 20
3a + 5 = 20
3a = 20 - 5
a = 5
f(3)=a(3)+5=20
3a+5=20
3a=20-5
3a=15
a=15/3
a= 5
Jadi, a nya adalah 5.