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b in (-oo:+oo)
1-(2*b) = 6*b+81 // - 6*b+81
1-(2*b)-(6*b)-81 = 0
1-2*b-6*b-81 = 0
-8*b-80 = 0 // + 80
-8*b = 80 // : -8
b = 80/(-8)
b = -10
b = -10
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