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AE // BD => <DBA = <BAE ( alternate interior angles) (1)
we have: _ AF is the bisector of <BAE => <x= <BAE/2 (2)
_ BC is the bisector of <DBA => <y= <DBA/2 (3)
(1) (2) (3) => <x = <y => AF//BC ( alternate interior angles)
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