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2x-3y=-4
5x-8y=-13
x=(3y-4)/2
sustitumos en la 1ª
5((3y-4)/2)-8y=-13
multiplicamos *2
5(3y-4)-16y=-26
15y-20-16y=-26
-y=-6
y=6
5x-8y=-13
sustituimos el valor de y
5x-48=-13
5x=48-13= 35
x=35/5=7