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2(J-3)=(J+6)/2
4J-12=J+6
3J=18
J=6
Juan tiene 6 años......espero k t sirva
doble de la edad de Juan = 2x
2(x - 3) = (x+6) /2
4 (x -3) =x + 6
4x - 12 = x + 6
4x -x = 6 + 12
3x =18
x = 18/3
x = 6
espero que te sirva, salu2!!!