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f(a) =11
maka,
f(a) = 2(a)-5 = 11
= 2a = 11+5
= 2a = 16
= a = 16/2
= a = 8
sehingga didapat nilai a = 8 (C)
f(11) = 2.11-5
= 22 - 5
= 17 (d)
Menurutku kek gitu....