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x - y = 20
2x= 60
x =30
reemplazamos x
30+y=40
y =10
y=40-x
-----------------
x-y=20
x-(40-x)=20
x-40+x=20
2x=20+40
2x=60
x=30
-----------------
y=40-30
y=10
Por tanto X=30 y Y=10