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