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b in (-oo:+oo)
(5/7)*b+8 = 6*b+1079/84 // - 6*b+1079/84
(5/7)*b-(6*b)-(1079/84)+8 = 0
(5/7)*b-6*b-1079/84+8 = 0
-37/7*b-407/84 = 0 // + 407/84
-37/7*b = 407/84 // : -37/7
b = 407/84/(-37/7)
b = -11/12
b = -11/12
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