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b in (-oo:+oo)
6*b+7*b+7 = 38/11 // - 38/11
6*b+7*b-(38/11)+7 = 0
6*b+7*b-38/11+7 = 0
13*b+39/11 = 0 // - 39/11
13*b = -39/11 // : 13
b = -39/11/13
b = -3/11
b = -3/11
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