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b in (-oo:+oo)
(6/7)*b-5/8 = 13/56 // - 13/56
(6/7)*b-5/8-(13/56) = 0
(6/7)*b-5/8-13/56 = 0
6/7*b-6/7 = 0 // + 6/7
6/7*b = 6/7 // : 6/7
b = 6/7/6/7
b = 1
b = 1
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