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u^3*((36*u^6-(28*u^4))/4) = 0
u^3*((36*u^6-28*u^4)/4) = 0
(u^3*(36*u^6-28*u^4))/4 = 0
36*u^6-28*u^4 = 0
4*u^4*(9*u^2-7) = 0
9*u^2 = 7 // : 9
u^2 = 7/9
u^2 = 7/9 // ^ 1/2
abs(u) = (7/9)^(1/2)
u = (7/9)^(1/2) or u = -(7/9)^(1/2)
4*u^4*(u-(7/9)^(1/2))*(u+(7/9)^(1/2)) = 0
(4*u^3*u^4*(u-(7/9)^(1/2))*(u+(7/9)^(1/2)))/4 = 0
( 4*u^4 )
4*u^4 = 0 // : 4
u^4 = 0
u = 0
( u+(7/9)^(1/2) )
u+(7/9)^(1/2) = 0 // - (7/9)^(1/2)
u = -(7/9)^(1/2)
( u-(7/9)^(1/2) )
u-(7/9)^(1/2) = 0 // + (7/9)^(1/2)
u = (7/9)^(1/2)
( u^3 )
1*u^3 = 0 // : 1
u^3 = 0
u = 0
u in { 0, -(7/9)^(1/2), (7/9)^(1/2), 0 }
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