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b in (-oo:+oo)
-33 = 3*b+5*b+7 // - 3*b+5*b+7
-(3*b)-(5*b)-33-7 = 0
-3*b-5*b-33-7 = 0
-8*b-40 = 0 // + 40
-8*b = 40 // : -8
b = 40/(-8)
b = -5
b = -5
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