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u in (-oo:+oo)
u^2+5*u+25/4 = 0
u^2+5*u+25/4 = 0
DELTA = 5^2-(1*4*25/4)
DELTA = 0
u = -5/(1*2)
u = -5/2 or u = -5/2
u in { -5/2, -5/2 }
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