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b in (-oo:+oo)
b+7/8 = 817/56-((1/7)*b) // - 817/56-((1/7)*b)
b+(1/7)*b+7/8-(817/56) = 0
b+(1/7)*b+7/8-817/56 = 0
8/7*b-96/7 = 0 // + 96/7
8/7*b = 96/7 // : 8/7
b = 96/7/8/7
b = 12
b = 12
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