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b in (-oo:+oo)
-(5*b)-5 = 25 // - 25
-(5*b)-25-5 = 0
-5*b-25-5 = 0
-5*b-30 = 0 // + 30
-5*b = 30 // : -5
b = 30/(-5)
b = -6
b = -6
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