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b in (-oo:+oo)
(6/7)*b-(5/6) = -13/210 // + -13/210
(6/7)*b-(5/6)-(-13/210) = 0
(6/7)*b-5/6+13/210 = 0
6/7*b-27/35 = 0 // + 27/35
6/7*b = 27/35 // : 6/7
b = 27/35/6/7
b = 9/10
b = 9/10
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