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b in (-oo:+oo)
(1/2)*b-((2/3)*b)-3 = -1 // + 1
(1/2)*b-((2/3)*b)-3+1 = 0
(1/2)*b+(-2/3)*b-3+1 = 0
-1/6*b-2 = 0 // + 2
-1/6*b = 2 // : -1/6
b = 2/(-1/6)
b = -12
b = -12
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