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Isabel : i
Fernanda + Isabel = 56
( i - 14 ) + i = 56
i - 14 + i = 56
2i = 56 + 14
2i = 70
i = 70 / 2
i = 35
isabel : i = 35 años
fernanda : ( i - 14) => 35 - 14 = 21 años