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c in (-oo:+oo)
-((1/8)*c) = 2 // - 2
-((1/8)*c)-2 = 0
(-1/8)*c-2 = 0
-1/8*c-2 = 0 // + 2
-1/8*c = 2 // : -1/8
c = 2/(-1/8)
c = -16
c = -16
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