x^3+8x^2+12x/20x

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Solution for x^3+8x^2+12x/20x equation: 


x in (-oo:+oo)

x^3+8*x^2+((12*x)/20)*x = 0

x^3+43/5*x^2 = 0

x^2*(x+43/5) = 0

x+43/5 = 0 // - 43/5

x = -43/5

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x in { -43/5, 0 }

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