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D( b )
2*b+1 = 0
b-2 = 0
2*b+1 = 0
2*b+1 = 0
2*b+1 = 0 // - 1
2*b = -1 // : 2
b = -1/2
b-2 = 0
b-2 = 0
b-2 = 0 // + 2
b = 2
b in (-oo:-1/2) U (-1/2:2) U (2:+oo)
(1-(2*b))/(b-2) = (b+2)/(2*b+1) // - (b+2)/(2*b+1)
(1-(2*b))/(b-2)-((b+2)/(2*b+1)) = 0
(1-2*b)/(b-2)-((b+2)/(2*b+1)) = 0
(1-2*b)/(b-2)+(-1*(b+2))/(2*b+1) = 0
((1-2*b)*(2*b+1))/((b-2)*(2*b+1))+(-1*(b+2)*(b-2))/((b-2)*(2*b+1)) = 0
(1-2*b)*(2*b+1)-1*(b+2)*(b-2) = 0
5-5*b^2 = 0
(5-5*b^2)/((b-2)*(2*b+1)) = 0
(5-5*b^2)/((b-2)*(2*b+1)) = 0 // * (b-2)*(2*b+1)
5-5*b^2 = 0
-5*b^2 = -5 // : -5
b^2 = 1
b^2 = 1 // ^ 1/2
abs(b) = 1
b = 1 or b = -1
b in { 1, -1 }
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