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eliminasikan 12a + 4b = 24 dan -5a+4b=-27 maka a=3 , b=-3 maka a+b=0
2) 2a+b = 3 dan c - 4 = -3 dan 3b+2c= -7
c=1 , b=-3 , a=3 maka a+b+c = 1