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b in (-oo:+oo)
-(5*b)-10 = 15 // - 15
-(5*b)-15-10 = 0
-5*b-15-10 = 0
-5*b-25 = 0 // + 25
-5*b = 25 // : -5
b = 25/(-5)
b = -5
b = -5
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