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b in (-oo:+oo)
(1/7)*b+6/7 = 46/49 // - 46/49
(1/7)*b+6/7-(46/49) = 0
(1/7)*b+6/7-46/49 = 0
1/7*b-4/49 = 0 // + 4/49
1/7*b = 4/49 // : 1/7
b = 4/49/1/7
b = 4/7
b = 4/7
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