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b in (-oo:+oo)
(1/3)*b+5/6 = (1/6)*b+6/7 // - (1/6)*b+6/7
(1/3)*b-((1/6)*b)+5/6-(6/7) = 0
(1/3)*b+(-1/6)*b+5/6-6/7 = 0
1/6*b-1/42 = 0 // + 1/42
1/6*b = 1/42 // : 1/6
b = 1/42/1/6
b = 1/7
b = 1/7
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