Factorize:
$2 a^{2}+b c-2 a b-a c 2$
We have:
$2 a^{2}+b c-2 a b-a c=\left(2 a^{2}-2 a b\right)-(a c-b c)$
$=2 a(a-b)-c(a-b)$
$=(a-b)(2 a-c)$
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