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(1/2)*x^3-(4*x^2)+8*x = 0
(1/2)*x^3-4*x^2+8*x = 0
1/2*x^3-4*x^2+8*x = 0
x*(1/2*x^2-4*x+8) = 0
1/2*x^2-4*x+8 = 0
DELTA = (-4)^2-(1/2*4*8)
DELTA = 0
x = 4/(1/2*2)
x = 4 or x = 4
x = 0
x = 0
x in { 4, 4, 0 }
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