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u in (-oo:+oo)
u^2+(6/3)*u^2-(5*u)-(24*u)+36 = 0
u^2+(6/3)*u^2-5*u-24*u+36 = 0
3*u^2-29*u+36 = 0
DELTA = (-29)^2-(3*4*36)
DELTA = 409
DELTA > 0
u = (409^(1/2)+29)/(2*3) or u = (29-409^(1/2))/(2*3)
u = (409^(1/2)+29)/6 or u = (29-409^(1/2))/6
u in { (29-409^(1/2))/6, (409^(1/2)+29)/6 }
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