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b in (-oo:+oo)
-7 < b/3 // - b/3
-(b/3)-7 < 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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