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Daniel= 2X
Jose= 2(2x)-20
X+2X+2(2x)-20=85
X+2x+4x-20=85
7x-20=85
7x=85+20
7x=105
X= 15
Alicia tiene 15
Daniel tiene 2(15)=30
Jose tiene 2(30)-20=40
Y para comprobar sumas las edades 15+30+40=85