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f(k) = 2k + 6 = 12
2k = 6
k = 3 (c)
semoga membantu
maka,x diganti k
f(k)= 2k+6
12 = 2k+6
12-6= 2k
6 = 2k
6/2= k
3= k
Jadi,nilai k adalah 3 (C)