Factorize:
$2 x+4 y-8 x y-1$
We have:
$2 x+4 y-8 x y-1=(2 x-8 x y)-(1-4 y)$
$=2 x(1-4 y)-1(1-4 y)$
$=(1-4 y)(2 x-1)$
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