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x=diego
(x+3)^2-x²=129
x²+6x+9-x²=129
x²-x²+6x+9=129
6x+9=129
6x=129-9
6x=120
x=120/6
x=20
x=20
x+3........20+3=23
ricardo tiene 23 años y diego tiene 20 años