RESOLVA OS SISTEMAS PELO METODO DA ADIÇÃO (COM CALCULOS) A) X-Y=5
X+Y=7
B) X+2Y=7
X-2Y=-5
C) 2X-Y=0
X+Y=-7
X+Y=7
B) X+2Y=7
X-2Y=-5
C) 2X-Y=0
X+Y=-7
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