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b in (-oo:+oo)
(6*b+3)/3-((3*b-1)/2) = (9*b+5)/6 // - (9*b+5)/6
(6*b+3)/3-((3*b-1)/2)-((9*b+5)/6) = 0
(6*b+3)/3+(-1*(3*b-1))/2+(-1*(9*b+5))/6 = 0
(2*6*(6*b+3))/(2*3*6)+(-1*3*6*(3*b-1))/(2*3*6)+(-1*2*3*(9*b+5))/(2*3*6) = 0
2*6*(6*b+3)-1*3*6*(3*b-1)-1*2*3*(9*b+5) = 0
18*b-54*b-30+54 = 0
24-36*b = 0
(24-36*b)/(2*3*6) = 0
(24-36*b)/(2*3*6) = 0 // * 2*3*6
24-36*b = 0
24-36*b = 0 // - 24
-36*b = -24 // : -36
b = -24/(-36)
b = 2/3
b = 2/3
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