factorize y²+ 2xy + 2xz - z²
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y² + 2xy + 2xz - z²
y² - z² + 2xy + 2xz
(y-z)(y+z) + 2x ( y+z)
(y+z) [ y-z +2x]
y² + 2xy + 2xz - z²
y² - z² + 2xy + 2xz
(y-z)(y+z) + 2x ( y+z)
(y+z) [ y-z +2x]
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