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Verified answer
MatriksNo.8
Karena matriks A = B, maka
4a = 12 ⇒ a = 3
-3b = 3a ⇒ 3(3) = -3b ⇒ b = -3
3c = b ⇒ 3c = -3 ⇒ c = -1
Jadi a + b + c = -1