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b in (-oo:+oo)
(1/3)*b-2 > 5 // - 5
(1/3)*b-5-2 > 0
1/3*b-7 > 0 // + 7
1/3*b > 7 // : 1/3
b > 7/1/3
b > 21
b in (21:+oo)
(21:+oo)
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