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f(a) = 2(a) +8 = 18
= 2a +8 = 18
= 2a = 18 -8
= 2a = 10
= a = 10/2
= a = 5
Jad, nilai a adalah 5.
Itu jawabannya.
f(a)=18
f(a)=2(a)+8=18
2a+8=18
2a=18-8
2a=10
a=10/2
a=5