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c in (-oo:+oo)
1 = c+1/(-8) // - c+1/(-8)
1-c-(1/(-8)) = 0
1/8-c+1 = 0
9/8-c = 0 // - 9/8
-c = -9/8 // * -1
c = 9/8
c = 9/8
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