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b in (-oo:+oo)
(2/3)*b > 12 // - 12
(2/3)*b-12 > 0
2/3*b-12 > 0 // + 12
2/3*b > 12 // : 2/3
b > 12/2/3
b > 18
b in (18:+oo)
(18:+oo)
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