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If (a+b-c)/(a+ b) =(b+c-a)/(b+c) = (c+a-...

If `(a+b-c)/(a+ b) =(b+c-a)/(b+c) = (c+a-b)/(c+a)` and `a+b+cne 0,` then prove that a = b = c.

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