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b in (-oo:+oo)
8-(5*b)-(6*b) = -80 // + 80
8-(5*b)-(6*b)+80 = 0
8-5*b-6*b+80 = 0
88-11*b = 0 // - 88
-11*b = -88 // : -11
b = -88/(-11)
b = 8
b = 8
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