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x in (-oo:+oo)
(1/10)*x^3-((1/10)*x^2)-(3*x) = 0
(1/10)*x^3+(-1/10)*x^2-3*x = 0
1/10*x^3-1/10*x^2-3*x = 0
x*(1/10*x^2-1/10*x-3) = 0
1/10*x^2-1/10*x-3 = 0
DELTA = (-1/10)^2-(-3*1/10*4)
DELTA = 121/100
DELTA > 0
x = ((121/100)^(1/2)+1/10)/(1/10*2) or x = (1/10-(121/100)^(1/2))/(1/10*2)
x = 6 or x = -5
x = 0
x = 0
x in { -5, 6, 0 }
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