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b in (-oo:+oo)
(1/2)*b-1 = -16/11 // + -16/11
(1/2)*b-(-16/11)-1 = 0
(1/2)*b+16/11-1 = 0
1/2*b+5/11 = 0 // - 5/11
1/2*b = -5/11 // : 1/2
b = -5/11/1/2
b = -10/11
b = -10/11
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