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Y= Laura
Ecuaciones
X=Y+21
(X+6)=2(Y+6)
X+6=2Y*+12
Sustituyendo X
Y+21 +6 =2Y+12
Trasponiendo términos
2Y-Y= 21+6-12
Y=15 *(Laura)
X=Y+21
X=15+21
X=36 años