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u in (-oo:+oo)
(1/3)*u^10-((2/3)*u^5) = 0
(1/3)*u^10+(-2/3)*u^5 = 0
1/3*u^10-2/3*u^5 = 0
t_1 = u^5
1/3*t_1^2-2/3*t_1^1 = 0
1/3*t_1^2-2/3*t_1 = 0
DELTA = (-2/3)^2-(0*1/3*4)
DELTA = 4/9
DELTA > 0
t_1 = ((4/9)^(1/2)+2/3)/(1/3*2) or t_1 = (2/3-(4/9)^(1/2))/(1/3*2)
t_1 = 2 or t_1 = 0
t_1 = 0
u^5+0 = 0
u^5 = 0
1*u^5 = 0 // : 1
u^5 = 0
u = 0
t_1 = 2
u^5-2 = 0
1*u^5 = 2 // : 1
u^5 = 2
u^5 = 2 // ^ 1/5
u = 2^(1/5)
u in { 0, 2^(1/5) }
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