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3x(-x+1) - 3(-x+1)
(-x+1) (3x-3)
2..3x^2-4x+1
3x^2-3x-x+1
3x(x-1) -1 (x-1)
(x-1)(3x-1)
3..3x^2+2x-1
3x^2+3x-x-1
3x(x+1) -1 (x-1)
(x+1) (3x-1)