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7x+6y= -13
multiplicamos la primera ecuacion por 6,asi eliminamos y
6(x-y=0)............6x-6y=0
7x+6y= -13.......7x-6y= -13
13x= -13.............x= -13/13.............x= -1
si x= -1
x-y=0
-1-y=0
-y=1
y= -1
solucion:
x= -1 y= -1