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sustituyo ahora en 2
2(3+y)+y=--2
6+2y+y=--2
6+3y=-2
3y=-2-6
y=-8/3 <-- este es un valor
Entonces sustituyo este valor en x=3+y
x=3+(-8/3)=9/3-(8/3)=1/3 <-- Este es el valor de X