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u in (-oo:+oo)
u^(7/3)-(2*u^(4/3))+u^(1/3) = 0
u^(7/3)-2*u^(4/3)+u^(1/3) = 0
u^(7/3)-2*u^(4/3)+u^(1/3) = 0
u^(1/3)*(u^2-2*u+1) = 0
u^2-2*u+1 = 0
DELTA = (-2)^2-(1*1*4)
DELTA = 0
u = 2/(1*2)
u = 1 or u = 1
u^(1/3) = 0
1*u^(1/3) = 0 // : 1
u^(1/3) = 0
u = 0
u in { 1, 1, 0 }
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