Please do no.8

  y2 - z2 + 2xy - 2xz=y+zy-z + 2xy-z=y-zy+z+2x=2x+y+zy-zSo, the other factor is y-z.

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y(2x+y+z) = 2xy +y2 +yz

y2 - z2 + 2xy -2xz
= y2 - z2 + 2xy -2xz  +yz  - yz
y2 + 2xy  + yz - yz -z2 -2xz
y(2x+y+z) -z(y+z+2x)
= (y-z)(2x+y+z)

So dividing the original expression by 2x +y +z we would get y-z

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