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b in (-oo:+oo)
(3/5)*b < -1/2 // + -1/2
(3/5)*b-(-1/2) < 0
(3/5)*b+1/2 < 0
3/5*b+1/2 < 0 // - 1/2
3/5*b < -1/2 // : 3/5
b < -1/2/3/5
b < -5/6
b in (-oo:-5/6)
(-oo:-5/6)
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