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b in (-oo:+oo)
(4/5)*b-3 < -11 // + 11
(4/5)*b-3+11 < 0
4/5*b+8 < 0 // - 8
4/5*b < -8 // : 4/5
b < -8/4/5
b < -10
b in (-oo:-10)
(-oo:-10)
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