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b in (-oo:+oo)
b/3 < 2 // - 2
b/3-2 < 0
1/3*b-2 < 0 // + 2
1/3*b < 2 // : 1/3
b < 2/1/3
b < 6
b in (-oo:6)
(-oo:6)
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