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2x/3 = x/4 +35
2x/3 - x/4 = 35
(8x -3x) /12 = 35
5x = 35*12
5x = 420
x = 420/5
x = 84
mi edad = 84 años
comprobamos
2*84/3 = 84/4 +35
168/3 = 21 +35
56 = 56