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b in (-oo:+oo)
(6/7)*b-6*b-(1/5) = 353/35 // - 353/35
(6/7)*b-6*b-(1/5)-(353/35) = 0
(6/7)*b-6*b-1/5-353/35 = 0
-36/7*b-72/7 = 0 // + 72/7
-36/7*b = 72/7 // : -36/7
b = 72/7/(-36/7)
b = -2
b = -2
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