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b in (-oo:+oo)
8-b-(7*b) = 16 // - 16
8-b-(7*b)-16 = 0
8-b-7*b-16 = 0
-8*b-8 = 0 // + 8
-8*b = 8 // : -8
b = 8/(-8)
b = -1
b = -1
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