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b in (-oo:+oo)
(5/6)*b = 15/8 // - 15/8
(5/6)*b-(15/8) = 0
(5/6)*b-15/8 = 0
5/6*b-15/8 = 0 // + 15/8
5/6*b = 15/8 // : 5/6
b = 15/8/5/6
b = 9/4
b = 9/4
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