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