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x(3x - 1) - 1(3x + 1) = 0
3x² - x - 3x - 1 = 0
3x² - 4x - 1 = 0
(x-1)(3x+1) = 0
x.3x + x.1 + (-1).3x + (-1).1 = 0
3x² + x - 3x - 1 = 0
3x² - 2x -1 = 0