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b in (-oo:+oo)
-(7*b)-b-5 = 35 // - 35
-(7*b)-b-35-5 = 0
-7*b-b-35-5 = 0
-8*b-40 = 0 // + 40
-8*b = 40 // : -8
b = 40/(-8)
b = -5
b = -5
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