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b in (-oo:+oo)
b/9-34 < -39 // + 39
b/9-34+39 < 0
1/9*b+5 < 0 // - 5
1/9*b < -5 // : 1/9
b < -5/1/9
b < -45
b in (-oo:-45)
(-oo:-45)
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