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u in (-oo:+oo)
u^3*((8*u^7-(4*u^3))/2) = 0
u^3*((8*u^7-4*u^3)/2) = 0
(u^3*(8*u^7-4*u^3))/2 = 0
8*u^7-4*u^3 = 0
4*u^3*(2*u^4-1) = 0
2*u^4 = 1 // : 2
u^4 = 1/2
u^4 = 1/2 // ^ 1/4
abs(u) = (1/2)^(1/4)
u = (1/2)^(1/4) or u = -(1/2)^(1/4)
4*u^3*(u-(1/2)^(1/4))*(u+(1/2)^(1/4)) = 0
(4*u^3*u^3*(u-(1/2)^(1/4))*(u+(1/2)^(1/4)))/2 = 0
( 4*u^3 )
4*u^3 = 0 // : 4
u^3 = 0
u = 0
( u+(1/2)^(1/4) )
u+(1/2)^(1/4) = 0 // - (1/2)^(1/4)
u = -(1/2)^(1/4)
( u-(1/2)^(1/4) )
u-(1/2)^(1/4) = 0 // + (1/2)^(1/4)
u = (1/2)^(1/4)
( u^3 )
1*u^3 = 0 // : 1
u^3 = 0
u = 0
u in { 0, -(1/2)^(1/4), (1/2)^(1/4), 0 }
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