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b in (-oo:+oo)
b+(6/7)*b+2 = 15/14 // - 15/14
b+(6/7)*b-(15/14)+2 = 0
b+(6/7)*b-15/14+2 = 0
13/7*b+13/14 = 0 // - 13/14
13/7*b = -13/14 // : 13/7
b = -13/14/13/7
b = -1/2
b = -1/2
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