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b in (-oo:+oo)
(-1/2)*b+(6/7)*b+5/8 = 115/56 // - 115/56
(-1/2)*b+(6/7)*b+5/8-(115/56) = 0
(-1/2)*b+(6/7)*b+5/8-115/56 = 0
5/14*b-10/7 = 0 // + 10/7
5/14*b = 10/7 // : 5/14
b = 10/7/5/14
b = 4
b = 4
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