Encontre o conjunto solução dos sistemas de equaçoes A) 2x+5y=13
-2x+7y=23
B) 7m-2n=-6
5m+2n=6
C) -1=-a-b
-5=-a+b
-2x+7y=23
B) 7m-2n=-6
5m+2n=6
C) -1=-a-b
-5=-a+b
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