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y ⇒ Largo
x * y = Área
(y-10)*(x+10)=xy+400
(x+10)*(x-5)=xy-50
Es un sistema de ecuaciones
xy+10y-10x-xy-400=0
xy-5y+10x-50+50=0
10y-10x=500
-5y+10x=0
5y=500
y=100
10*100-10x=500
-10x=-500
x=50
Las dimensiones son 100 de largo y 50 de ancho