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b in (-oo:+oo)
(4/3)*b < 12 // - 12
(4/3)*b-12 < 0
4/3*b-12 < 0 // + 12
4/3*b < 12 // : 4/3
b < 12/4/3
b < 9
b in (-oo:9)
(-oo:9)
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