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f(a)=19
dit nilaiii a
19=3X+4
3X=19-4=15
X=15/3=5!!!!!
easy!!!!!
f(a) = 3(a) +4 = 19
= 3a +4 = 19
= 3a = 19 -4
= 3a = 15
= a = 15/3
= a = 5
Jadi, nilai a adalah 5.