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B = 2x + 3
(A-B)(A+B)
((3x -1)-(2x + 3))((3x - 1)+(2x +3))
(3x -1 - 2x - 3)(3x - 1 + 2x +3)
(3x - 2x - 1 - 3)(3x + 2x - 1 + 3)
(x - 4)(5x + 2)
5x² + 2x - 20x - 8
5x² -18x - 8 (A)