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b in (-oo:+oo)
(2*b-1)/2 = (b-1)/6 // - (b-1)/6
(2*b-1)/2-((b-1)/6) = 0
(2*b-1)/2+(-1*(b-1))/6 = 0
(6*(2*b-1))/(2*6)+(-1*2*(b-1))/(2*6) = 0
6*(2*b-1)-1*2*(b-1) = 0
10*b-4 = 0
(10*b-4)/(2*6) = 0
(10*b-4)/(2*6) = 0 // * 2*6
10*b-4 = 0
10*b-4 = 0 // + 4
10*b = 4 // : 10
b = 4/10
b = 2/5
b = 2/5
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