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b in (-oo:+oo)
5/6 > (-3/8)*b // - (-3/8)*b
5/6-((-3/8)*b) > 0
(3/8)*b+5/6 > 0
3/8*b+5/6 > 0 // - 5/6
3/8*b > -5/6 // : 3/8
b > -5/6/3/8
b > -20/9
b in (-20/9:+oo)
(-20/9:+oo)
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