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b in (-oo:+oo)
(8*b)/15 = 3/5 // - 3/5
(8*b)/15-(3/5) = 0
(8*b)/15-3/5 = 0
8/15*b-3/5 = 0 // + 3/5
8/15*b = 3/5 // : 8/15
b = 3/5/8/15
b = 9/8
b = 9/8
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