Problem

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Tags: algebra, radical



Prove that if $$\sqrt{x + a} +\sqrt{y+b}+\sqrt{z + c} =\sqrt{y + a} +\sqrt{z + b} +\sqrt{x + c} =\sqrt{z + a} +\sqrt{x+b}+\sqrt{y+c}$$for some $a, b, c, x, y, z$, then $x = y = z$ or $a = b = c$.