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f(k)=33
f(k)=3k+9=33
= 3k=33-9
= 3k = 24
=k = 8
f(k)=33
misal f(x)=3x+9=33
3x =33-9
3x =24
x = 24/3
x =8
lalu cobakan ke soal:
f(x)=3x+9
f(8)=3×8 +9=33
jadi nilai k adalah 8