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(x^4)/3-((5*x^2)/3)+6 = 0
(x^4)/3+(-5/3)*x^2+6 = 0
1/3*x^4-5/3*x^2+6 = 0
t_1 = x^2
1/3*t_1^2-5/3*t_1^1+6 = 0
1/3*t_1^2-5/3*t_1+6 = 0
DELTA = (-5/3)^2-(1/3*4*6)
DELTA = -47/9
DELTA < 0
x belongs to the empty set
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