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b in (-oo:+oo)
6-6*b = 7*b-111 // - 7*b-111
6-6*b-(7*b)+111 = 0
6-6*b-7*b+111 = 0
117-13*b = 0 // - 117
-13*b = -117 // : -13
b = -117/(-13)
b = 9
b = 9
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