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b in (-oo:+oo)
(6/7)*b-(6*b)-6 = -186/7 // + -186/7
(6/7)*b-(6*b)-(-186/7)-6 = 0
(6/7)*b-6*b+186/7-6 = 0
144/7-36/7*b = 0 // - 144/7
-36/7*b = -144/7 // : -36/7
b = -144/7/(-36/7)
b = 4
b = 4
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