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-2x-7y=-5 (-4)
-8x+6y=14
8 x+28y=20
-8x+6y=14
....................
0 + 34y = 34
y= 34/34
y= 1
remplazamos y en una ecuacion
-2x-7(1)=-5
-2x =-5+7
_-2 x = 2
x= -2/2
x= -1