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x in (-oo:+oo)
(x^3)/10-(12*x) = (x^2)/5 // - (x^2)/5
(x^3)/10-((x^2)/5)-(12*x) = 0
(x^3)/10-((x^2)/5)-12*x = 0
1/10*x^3-1/5*x^2-12*x = 0
x*(1/10*x^2-1/5*x-12) = 0
1/10*x^2-1/5*x-12 = 0
DELTA = (-1/5)^2-(-12*1/10*4)
DELTA = 121/25
DELTA > 0
x = ((121/25)^(1/2)+1/5)/(1/10*2) or x = (1/5-(121/25)^(1/2))/(1/10*2)
x = 12 or x = -10
x = 0
x = 0
x in { -10, 12, 0 }
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