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u in (-oo:+oo)
u^3*((10*u^6-(14*u^3))/2) = 0
u^3*((10*u^6-14*u^3)/2) = 0
(u^3*(10*u^6-14*u^3))/2 = 0
10*u^6-14*u^3 = 0
2*u^3*(5*u^3-7) = 0
5*u^3 = 7 // : 5
u^3 = 7/5
u^3 = 7/5 // ^ 1/3
u = (7/5)^(1/3)
2*u^3*(u-(7/5)^(1/3)) = 0
(2*u^3*u^3*(u-(7/5)^(1/3)))/2 = 0
( 2*u^3 )
2*u^3 = 0 // : 2
u^3 = 0
u = 0
( u-(7/5)^(1/3) )
u-(7/5)^(1/3) = 0 // + (7/5)^(1/3)
u = (7/5)^(1/3)
( u^3 )
1*u^3 = 0 // : 1
u^3 = 0
u = 0
u in { 0, (7/5)^(1/3), 0 }
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