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2x+y=7
multiplicamos por -2 la primera ecaucion,asi eliminamos la variable x
-2(x+2y=5)................ -2x-4y= -10
2x+y=7........................2x+y=7
-3y= -3........y= -3/-3.......y=1
si y=1
2x+y=7
2x+1=7
2x=7-1
2x=6
x=6/2
x=3
solucion:
x=3 y=1