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b in (-oo:+oo)
(1/2)*b-((1/3)*b) = 1/2-2 // - 1/2-2
(1/2)*b-((1/3)*b)-(1/2)+2 = 0
(1/2)*b+(-1/3)*b-1/2+2 = 0
1/6*b+3/2 = 0 // - 3/2
1/6*b = -3/2 // : 1/6
b = -3/2/1/6
b = -9
b = -9
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