f(x)= 7x-12
f(a)= 7a-12
30= 7a-12
30+12= 7a
42=7a
a=6
JAWABAN : C
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f(x)= 7x-12
f(a)= 7a-12
30= 7a-12
30+12= 7a
42=7a
a=6
JAWABAN : C