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(x+3)*(y+3)=56
x=20/y
(20/y+3)*(y+3)=56
hacemos operaciones
20y+3y^2+60+9y=56y
simplificamos
3y^2-27y+60=0
div 3
y^2-9y+20=0
resolvemos la e. de 2º grado
y1=5 y2=4
los numeros seran 4 y 5