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b in (-oo:+oo)
(5/7)*b-6*b+9 = 393/56 // - 393/56
(5/7)*b-6*b-(393/56)+9 = 0
(5/7)*b-6*b-393/56+9 = 0
111/56-37/7*b = 0 // - 111/56
-37/7*b = -111/56 // : -37/7
b = -111/56/(-37/7)
b = 3/8
b = 3/8
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