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f(a) = 7
3a + 4 = 7
3a = 7-4
3a = 3
a = 1
maka nilai a = 1
jadi f(a)=7
f(a):3(a)+4=7
:3a+4=7
:3a=7-4
3a=3
a=3/3
a=1
jadi nilai a =1
kalu bisa jadikan yang terbaik ya