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u in (-oo:+oo)
u^3*((9*u^7-(15*u^3))/3) = 0
u^3*((9*u^7-15*u^3)/3) = 0
(u^3*(9*u^7-15*u^3))/3 = 0
9*u^7-15*u^3 = 0
3*u^3*(3*u^4-5) = 0
3*u^4 = 5 // : 3
u^4 = 5/3
u^4 = 5/3 // ^ 1/4
abs(u) = (5/3)^(1/4)
u = (5/3)^(1/4) or u = -(5/3)^(1/4)
3*u^3*(u-(5/3)^(1/4))*(u+(5/3)^(1/4)) = 0
(3*u^3*u^3*(u-(5/3)^(1/4))*(u+(5/3)^(1/4)))/3 = 0
( 3*u^3 )
3*u^3 = 0 // : 3
u^3 = 0
u = 0
( u+(5/3)^(1/4) )
u+(5/3)^(1/4) = 0 // - (5/3)^(1/4)
u = -(5/3)^(1/4)
( u-(5/3)^(1/4) )
u-(5/3)^(1/4) = 0 // + (5/3)^(1/4)
u = (5/3)^(1/4)
( u^3 )
1*u^3 = 0 // : 1
u^3 = 0
u = 0
u in { 0, -(5/3)^(1/4), (5/3)^(1/4), 0 }
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