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b in (-oo:+oo)
(2/15)*b-(4/5) < 2/3 // - 2/3
(2/15)*b-(4/5)-(2/3) < 0
(2/15)*b-4/5-2/3 < 0
2/15*b-22/15 < 0 // + 22/15
2/15*b < 22/15 // : 2/15
b < 22/15/2/15
b < 11
b in (-oo:11)
(-oo:11)
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