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2a-6 + 3b - 6 = -3
2a + 3b = -3 + 6 + 6
2a + 3b = 9
pasangan yg cocok adalah yg d.(6,-1) karena
2(6) + 3(-1) = 9
12 - 3 = 9
9 = 9 (terbukti) !!