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b in (-oo:+oo)
-(3*b)-9 = 15 // - 15
-(3*b)-15-9 = 0
-3*b-15-9 = 0
-3*b-24 = 0 // + 24
-3*b = 24 // : -3
b = 24/(-3)
b = -8
b = -8
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