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b in (-oo:+oo)
(1/2)*b < 11.5 // - 11.5
(1/2)*b-11.5 < 0
1/2*b-11.5 < 0 // + 11.5
1/2*b < 11.5 // : 1/2
b < 11.5/1/2
b < 23
b in (-oo:23)
(-oo:23)
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