Answer
$(12x-1)(x-1)$
Work Step by Step
Use $-13x=-12x-x$
$12x^2-13x+1=12x^2-12x-x+1=(12x)x+(12x)(-1)+(-1)x+(-1)(-1)=12x(x-1)+(-1)(x-1)=(12x-1)(x-1)$
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