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b in (-oo:+oo)
(-1/2)*b+8 = 11/2 // - 11/2
(-1/2)*b-(11/2)+8 = 0
(-1/2)*b-11/2+8 = 0
5/2-1/2*b = 0 // - 5/2
-1/2*b = -5/2 // : -1/2
b = -5/2/(-1/2)
b = 5
b = 5
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