x^3 - 3x^2 - 4x + 12=0
x^2 (x - 3) - 4(x - 3) = 0
(x - 2)(x + 2)(x - 3) = 0
x1 = 2
x2 = -2
x3 = 3
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x^3 - 3x^2 - 4x + 12=0
x^2 (x - 3) - 4(x - 3) = 0
(x - 2)(x + 2)(x - 3) = 0
x1 = 2
x2 = -2
x3 = 3