Is this hard?

Algebra Level 1

\[\dfrac{x^2- (y-z)^2}{(x+z)^2- y^2} + \dfrac{y^2- (x-z)^2}{(x+y)^2- z^2} + \dfrac{z^2- (x-y)^2}{(y+z)^2- x^2} = ?\]

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