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