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b in (-oo:+oo)
-(6*b)-9 = -39 // + 39
39-(6*b)-9 = 0
39-6*b-9 = 0
30-6*b = 0 // - 30
-6*b = -30 // : -6
b = -30/(-6)
b = 5
b = 5
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