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b in (-oo:+oo)
(1/3)*(2*b+9) = (2/3)*(1*b+9/2) // - (2/3)*(1*b+9/2)
(1/3)*(2*b+9)-((2/3)*(1*b+9/2)) = 0
(1/3)*(2*b+9)+(-2/3)*(b+9/2) = 0
1/3*(2*b+9)-2/3*(b+9/2) = 0
1/3*(2*b+9)-2/3*(b+9/2) = 0
0 = 0
0 = 0
b belongs to the empty set
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