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b in (-oo:+oo)
(b-1)/6-(b*((2*b-1)/5)) = 0
(b-1)/6+(-1*b*(2*b-1))/5 = 0
(5*(b-1))/(5*6)+(-1*6*b*(2*b-1))/(5*6) = 0
5*(b-1)-1*6*b*(2*b-1) = 0
11*b-12*b^2-5 = 0
11*b-12*b^2-5 = 0
11*b-12*b^2-5 = 0
DELTA = 11^2-(-12*(-5)*4)
DELTA = -119
DELTA < 0
1 = 0
1/(5*6) = 0
1/(5*6) = 0 // * 5*6
1 = 0
b belongs to the empty set
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