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3x^3 - 12x + 5x^2 - 20 = 0
3x (x^2 - 4) + 5(x^2 - 4) = 0
(3x + 5) (x^2 - 4) = 0
(3x + 5)* (x - 2) * ( x + 2) = 0
x = ± 2
x = - 5/3