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b in (-oo:+oo)
(5/8)*b+3/8 = -1 // + 1
(5/8)*b+3/8+1 = 0
5/8*b+11/8 = 0 // - 11/8
5/8*b = -11/8 // : 5/8
b = -11/8/5/8
b = -11/5
b = -11/5
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