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maka,
f(5) = 2a
a.5-9 = 2a
5a-9 = 2a
5a-2a = 9
3a = 9
a = 9/3
a = 3
f(5)= 2a
a=..?
f(a)= 2a.5 - 9
a =10 - 9
a = 1
smoga bermanfaat ya