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b in (-oo:+oo)
b/2 < 13 // - 13
b/2-13 < 0
1/2*b-13 < 0 // + 13
1/2*b < 13 // : 1/2
b < 13/1/2
b < 26
b in (-oo:26)
(-oo:26)
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