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u in (-oo:+oo)
u^2*((10*u^4-(16*u^3))/2) = 0
u^2*((10*u^4-16*u^3)/2) = 0
(u^2*(10*u^4-16*u^3))/2 = 0
10*u^4-16*u^3 = 0
2*u^3*(5*u-8) = 0
5*u-8 = 0 // + 8
5*u = 8 // : 5
u = 8/5
2*u^3*(u-8/5) = 0
(2*u^2*u^3*(u-8/5))/2 = 0
( 2*u^3 )
2*u^3 = 0 // : 2
u^3 = 0
u = 0
( u-8/5 )
u-8/5 = 0 // + 8/5
u = 8/5
( u^2 )
1*u^2 = 0 // : 1
u^2 = 0
u = 0
u in { 0, 8/5, 0 }
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