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b in (-oo:+oo)
67 = 6*b-b+7 // - 6*b-b+7
b-(6*b)-7+67 = 0
b-6*b-7+67 = 0
60-5*b = 0 // - 60
-5*b = -60 // : -5
b = -60/(-5)
b = 12
b = 12
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