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2/5 = ED/10
5ED = 10 x 2
5ED = 20
ED = 4
EB/AB = BD/BC
2/5 = BD/BD + 6
2(BD + 6) = 5BD
2BD + 12 = 5BD
12 = 5BD - 2BD
12 = 3BD
BD = 12/3
BD = 4