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u in (-oo:+oo)
u^2+(12/3)*u^2+8*u+3*u-6 = 0
5*u^2+11*u-6 = 0
DELTA = 11^2-(-6*4*5)
DELTA = 241
DELTA > 0
u = (241^(1/2)-11)/(2*5) or u = (-241^(1/2)-11)/(2*5)
u = (241^(1/2)-11)/10 or u = (-(241^(1/2)+11))/10
u in { (-(241^(1/2)+11))/10, (241^(1/2)-11)/10 }
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