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5/3 .x +7 = 2/3.x +25
5x/3 +7 = 2x/3 +25
5x/3 - 2x/3 = 25 -7
3x/3 = 18
x = 18
edad de maria = 18 años
comprobamos para ver si esta bien
5x/3 +7 = 2x/3 +25
5*18/3+7 = 2*18/3 +25
30+7 = 12+25
37 = 37