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