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x-y=40
hacemos reduccion
x+y=120
x-y=40
2x+0y=160
2x=160
x=160/2
x=80
si x=80
x+y=120
80+y=120
y=120-80
y=40
los numeros son 80 y 40
a-b=40
2a=160
a=80
a+b=120
80+b=120
b=120-80
b=40
a=80 y b=40