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2x-4y=0 /*-1
2x+3y= -3
-2x+4y=0
7y=-3
y=-3/7
reemplazamos en y
2x - 4y = 0
2x - 4* -3/7 = 0
2x +12/7 = 0
x=(-12/7)/2
x= -6/7