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b in (-oo:+oo)
1-2*b = -5/7 // + -5/7
1-2*b-(-5/7) = 0
5/7-2*b+1 = 0
12/7-2*b = 0 // - 12/7
-2*b = -12/7 // : -2
b = -12/7/(-2)
b = 6/7
b = 6/7
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