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b in (-oo:+oo)
(6*b)/2-(11*b)-2 = 0
(6*b)/2-11*b-2 = 0
-8*b-2 = 0 // + 2
-8*b = 2 // : -8
b = 2/(-8)
b = -1/4
b = -1/4
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