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b in (-oo:+oo)
7*(1-(6*b)) = -77 // + 77
7*(1-(6*b))+77 = 0
7*(1-6*b)+77 = 0
7*(1-6*b)+77 = 0
84-42*b = 0
84-42*b = 0
84-42*b = 0 // - 84
-42*b = -84 // : -42
b = -84/(-42)
b = 2
b = 2
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