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