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b in (-oo:+oo)
9-5*b-(6*b) = 108 // - 108
9-5*b-(6*b)-108 = 0
9-5*b-6*b-108 = 0
-11*b-99 = 0 // + 99
-11*b = 99 // : -11
b = 99/(-11)
b = -9
b = -9
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