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f(k) = 3k - 4
3k - 4 = 8
3k = 8 + 4
3k = 12
k = 12 / 3
k = 4
f(k)= 8
f(k)= 3k - 4= 8
3k= 8 + 4
3k= 12
k= 12 / 3
k= 4
Jadi, n nilai k adalah 4 (b).