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(2/3)*x^3-(4*x^2)+8*x = 0
(2/3)*x^3-4*x^2+8*x = 0
2/3*x^3-4*x^2+8*x = 0
2*x*(1/3*x^2-2*x+4) = 0
1/3*x^2-2*x+4 = 0
DELTA = (-2)^2-(1/3*4*4)
DELTA = -4/3
DELTA < 0
2*x = 0
2*x = 0 // : 2
x = 0
x = 0
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