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Four points A(6,\ 3),\ \ B(-3,\ 5),\ ...

Four points `A(6,\ 3),\ \ B(-3,\ 5),\ \ C(4,\ -2)` and `D(x ,\ 3x)` are given in such a way that `( D B C)/( A B C)=1/2` , find `x` .

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