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b in (-oo:+oo)
76 = 6*b+5*b-1 // - 6*b+5*b-1
1-(6*b)-(5*b)+76 = 0
1-6*b-5*b+76 = 0
77-11*b = 0 // - 77
-11*b = -77 // : -11
b = -77/(-11)
b = 7
b = 7
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