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b in (-oo:+oo)
-2*b-(6*b)-9 = 39 // - 39
-2*b-(6*b)-39-9 = 0
-2*b-6*b-39-9 = 0
-8*b-48 = 0 // + 48
-8*b = 48 // : -8
b = 48/(-8)
b = -6
b = -6
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