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b in (-oo:+oo)
(1/2)*b+6*b+5 = 23/2 // - 23/2
(1/2)*b+6*b-(23/2)+5 = 0
(1/2)*b+6*b-23/2+5 = 0
13/2*b-13/2 = 0 // + 13/2
13/2*b = 13/2 // : 13/2
b = 13/2/13/2
b = 1
b = 1
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