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x-y=3
---------
2x= 13
x= 6,5
y=3,5
a-b=3
por lo tanto a=13/2
13/2+b=10
b=20/2 -13/2
b=7/2
los numeros son 13/2,7/2
comprobacion:
13/2+7/2=10
20/2=10
13/2-7/2=6/2=3