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Algebra Level 1

x2(yz)2(x+z)2y2+y2(xz)2(x+y)2z2+z2(xy)2(y+z)2x2=?\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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