Factorize:
$x^{2}+x y-2 x z-2 y z$
We have:
$x^{2}+x y-2 x z-2 y z=\left(x^{2}+x y\right)-(2 x z+2 y z)$
$=x(x+y)-2 z(x+y)$
$=(x+y)(x-2 z)$
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