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f(a) = 4a + 3 .......ganti nilai x dengan a
-5 = 4a + 3 .......ganti nilai f(a) dengan nilai yg tlh dikethui, yaitu -5
-5-3 = 4a
-8 = 4a
a = -8/4
a = -2
jadi, nilai a = -2
4a = - 8
a = - 2