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b in (-oo:+oo)
(1/2)*(4*b-2) = 2*(1-b) // - 2*(1-b)
(1/2)*(4*b-2)-(2*(1-b)) = 0
(1/2)*(4*b-2)-2*(1-b) = 0
1/2*(4*b-2)-2*(1-b) = 0
1/2*(4*b-2)-2*(1-b) = 0
4*b-3 = 0
4*b-3 = 0
4*b-3 = 0 // + 3
4*b = 3 // : 4
b = 3/4
b = 3/4
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