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6x=-85+18y
x=(-85+18y)/6
sustituimos en la segunda ecuacion:
24x-5y=-5
24(-85+18y/6)-5y=-5
4(-85+18y)-5y=-5
-340+72y-5y=-5
67y=335
y=5
Reemplazamos el valor de y en una de las ecuaciones:
24x-5y=-5
24x-5(5)=-5
24x-25=-5
24x=20
x=20/24