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f(k) = 33
33 = 3k + 9
3k = 33 - 9
3k = 24
k = 8
f(k) = 3(k) +9 = 33
= 3k +9 = 33
= 3k = 33 -9
= 3k = 24
= k = 24/3
= k = 8
Jadi, nilai k adalah 8.