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b in (-oo:+oo)
-73 = 7*b+b-1 // - 7*b+b-1
1-(7*b)-b-73 = 0
1-7*b-b-73 = 0
-8*b-72 = 0 // + 72
-8*b = 72 // : -8
b = 72/(-8)
b = -9
b = -9
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