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b in (-oo:+oo)
-(5*b)-8 = -13 // + 13
13-(5*b)-8 = 0
13-5*b-8 = 0
5-5*b = 0 // - 5
-5*b = -5 // : -5
b = -5/(-5)
b = 1
b = 1
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