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f(x) = 3x+9
= 3(33) = 9
= 99+9
=108
fk = 33
berati x yang ada di angka 3 x diganti menjadi 3k
fk = 3k +9 =33
3k = 33-9
3k= 24
k= 8
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setau saya begitu karena kemarin baru dipelajari