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b in (-oo:+oo)
b/9-34 < -36 // + 36
b/9-34+36 < 0
1/9*b+2 < 0 // - 2
1/9*b < -2 // : 1/9
b < -2/1/9
b < -18
b in (-oo:-18)
(-oo:-18)
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