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