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b in (-oo:+oo)
-(3*b)-(6*b)-7 = 38 // - 38
-(3*b)-(6*b)-38-7 = 0
-3*b-6*b-38-7 = 0
-9*b-45 = 0 // + 45
-9*b = 45 // : -9
b = 45/(-9)
b = -5
b = -5
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