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b in (-oo:+oo)
5*b-6 = -23/8 // + -23/8
5*b-(-23/8)-6 = 0
5*b+23/8-6 = 0
5*b-25/8 = 0 // + 25/8
5*b = 25/8 // : 5
b = 25/8/5
b = 5/8
b = 5/8
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