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u in (-oo:+oo)
28*u^5-(u^2*((36*u^4)/4)) = 0
28*u^5-9*u^6 = 0
28*u^5-9*u^6 = 0
u^5*(28-9*u) = 0
28-9*u = 0 // - 28
-9*u = -28 // : -9
u = -28/(-9)
u = 28/9
u^5 = 0
1*u^5 = 0 // : 1
u^5 = 0
u = 0
u in { 28/9, 0 }
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