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Algebra Level 3

If a,b,ca, b, c are the sides of a triangle, then find the minimum value of the expression ac+ab+ba+bc+cb+ca.\frac { a }{ c+a-b } +\frac { b }{ a+b-c } +\frac { c }{ b+c-a } .

(This question is a modification of the one that appeared in RMO 1999)

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