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x-y=40
(x+y)/8=11
x+y=88
Sumamos ambas igualdades.
(x-y)+(x+y)=40+88
x-y+x+y=128
2x=128
x=64
x-y=40
64-y=40
64-40=y
24=y
Los números son 64 y 24.