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lorenzo :63
x+y=84............................................................................x=84-y
x+80=3(y+4).........x+80=3y+12.........x=3y+12-80................x=3y-68
hacemos igualacion:
84-y=3y-68
84+68=3y+y
152=4y
152/4=y
38=y
si y=38
x+y=84
x+38=84
x=84-38
x=46
lorenzo tiene 46 y eliza tiene 38