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12x^2-7x+1
=12x^2-(4+3)x+1
=12x^2-4x-3x+1
=4x(3x-1)-1(3x-1)
=(4x-1)(3x-1)
=12x^2-(4+3)x+1
=12x^2-4x-3x+1
=4x(3x-1)-1(3x-1)
=(4x-1)(3x-1)
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