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b in (-oo:+oo)
(2/3)*b > 9 // - 9
(2/3)*b-9 > 0
2/3*b-9 > 0 // + 9
2/3*b > 9 // : 2/3
b > 9/2/3
b > 27/2
b in (27/2:+oo)
(27/2:+oo)
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