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b in (-oo:+oo)
-4*b-(5/8) = -((5/6)*b)-469/264 // + -((5/6)*b)-469/264
(5/6)*b-4*b-(5/8)-(-469/264) = 0
(5/6)*b-4*b-5/8+469/264 = 0
38/33-19/6*b = 0 // - 38/33
-19/6*b = -38/33 // : -19/6
b = -38/33/(-19/6)
b = 4/11
b = 4/11
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