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b in (-oo:+oo)
(5/8)*b = 10-b // - 10-b
(5/8)*b+b-10 = 0
13/8*b-10 = 0 // + 10
13/8*b = 10 // : 13/8
b = 10/13/8
b = 80/13
b = 80/13
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