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f(a) = 9
f(a) = 2a+1
9 = 2a+1
9-1 = 2a
8 = 2a
a = 4
5a = 5(4) = b. 20
f(a) ⇒ 2a+1 = 9
2a = 9- 1
2a = 8
a = 8/2
a = 4
5a = 5(4)
= 20
jawabannya B