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b in (-oo:+oo)
(5/3)*b^2 = 6*b // - 6*b
(5/3)*b^2-(6*b) = 0
(5/3)*b^2-6*b = 0
5/3*b^2-6*b = 0
DELTA = (-6)^2-(0*5/3*4)
DELTA = 36
DELTA > 0
b = (36^(1/2)+6)/(5/3*2) or b = (6-36^(1/2))/(5/3*2)
b = 18/5 or b = 0
b in { 0, 18/5 }
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