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X×y=713
X × y= 713
(54-y)y= 713
54y-y^2= 713
-Y^2-54y-713=0
-b+- √( b^2-4ac)÷2a
Y= 31
Se reemplaza la primera ecuación
X+y= 54
X+31=54
X=54-31
X=23
Segundo numero es: 23.