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40=(ae-bd)/2 aqui queda
80=ae-bd
de aqui ae=80+bd
por dato ab=ae=ed
ahora sabemos or propiesdad que ae+ed+db+ba=360
reemplazamos y listo
ae+ae+db+ae=360
3ae+bd=360
de aqui ae= (360-bd)/3
igualamos y ya
(360-bd)/3=80+bd
360-bd=240+3bd
120=4bd
bd=30