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b in (-oo:+oo)
9.1 = b/(-2) // - b/(-2)
9.1-(b/(-2)) = 0
1/2*b+9.1 = 0 // - 9.1
1/2*b = -9.1 // : 1/2
b = -9.1/1/2
b = -18.2
b = -18.2
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