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u in (-oo:+oo)
u^3*((16*u^7-(18*u^5))/2) = 0
u^3*((16*u^7-18*u^5)/2) = 0
(u^3*(16*u^7-18*u^5))/2 = 0
16*u^7-18*u^5 = 0
2*u^5*(8*u^2-9) = 0
8*u^2 = 9 // : 8
u^2 = 9/8
u^2 = 9/8 // ^ 1/2
abs(u) = (9/8)^(1/2)
u = (9/8)^(1/2) or u = -(9/8)^(1/2)
2*u^5*(u-(9/8)^(1/2))*(u+(9/8)^(1/2)) = 0
(2*u^3*u^5*(u-(9/8)^(1/2))*(u+(9/8)^(1/2)))/2 = 0
( 2*u^5 )
2*u^5 = 0 // : 2
u^5 = 0
u = 0
( u+(9/8)^(1/2) )
u+(9/8)^(1/2) = 0 // - (9/8)^(1/2)
u = -(9/8)^(1/2)
( u-(9/8)^(1/2) )
u-(9/8)^(1/2) = 0 // + (9/8)^(1/2)
u = (9/8)^(1/2)
( u^3 )
1*u^3 = 0 // : 1
u^3 = 0
u = 0
u in { 0, -(9/8)^(1/2), (9/8)^(1/2), 0 }
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