(3x - 1)2 – (3x - 2) (3x + 1)
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(3x-1)^2 - (3x-2)(3x+1)
= 9x^2 - 6x + 1 - (9x^2 + 3x - 6x -2)
= 9x^2 - 6x + 1 - 9x^2 - 3x + 6x + 2
= -3x + 3
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