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b in (-oo:+oo)
b/(-2)-12 < 11 // - 11
b/(-2)-12-11 < 0
-1/2*b-23 < 0 // + 23
-1/2*b < 23 // : -1/2
b > 23/(-1/2)
b > -46
b in (-46:+oo)
(-46:+oo)
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