The value of x for which --(x-1)(x-3)(x+5)<0
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there are two negative sign in front they both get cancelled
(x-1)(x-3)(x+5)<0
(x^2 - 3x-x+3)(x+5)<0
(x^2 - 4x+3)(x+5)<0
(x^3-4x^2 +3x+5x^2 - 20x+15)
(x^3-x^2 - 17x+15)<0
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