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b in (-oo:+oo)
(5*b)/8-5 = 2*b-(1/6) // - 2*b-(1/6)
(5*b)/8-(2*b)+1/6-5 = 0
(5*b)/8-2*b+1/6-5 = 0
-11/8*b-29/6 = 0 // + 29/6
-11/8*b = 29/6 // : -11/8
b = 29/6/(-11/8)
b = -116/33
b = -116/33
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