D and E are the points on the sides A B ...

`D` and `E` are the points on the sides `A B` and `A C` respectively of a triangle ` A B C` such that: `A D=8c m ,\ \ D B=12 c m ,\ \ A E=6c m` and `C E=9c m` . Prove that `B C=5//2\ D E` .

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