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f(a)=5(a)-3=-8
5a-3=-8
5a=-8+3
5a=-5
a=-5/5
a=-1
f(x) = 5x - 3
f(a) = 5a - 3 = -8
= 5a = -8 + 3
= 5a = -5
= a = -5 / 5
= a = -1
Jadi nilai a adalah -1
Semoga membantu ^_^
maaf kalau salah