Quantitative Aptitude Algebra Identities

What is \( \frac{x^2-y^2-z^2-2 y z}{x^2+y^2-z^2+2 x y}\) + \(\frac{x^2-y^2-z^2-2 y z}{x^2-y^2+z^2-2 x z}\) equal to ?

1
\(\frac{x}{x+y-z}\)
2
\(\frac{y+z}{x+y-z}\)
3
\(\frac{2 {x}}{{x}+{y}-{z}}\)
4
\(\frac{2 y+2 z}{x+y-z}\)

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