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Nah berarti x nya itu pakai (a + 3)
Jadi,
3(a + 3) -7
3a + 9 - 7
3a + 2 (B)
Semoga membantu ya ^_^
f(a+3)= 3(a+3)-7
f(a+3)= 3a+9-21
f(a+3)= 3a-16
ntuh jawabannya D