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c in (-oo:+oo)
1/2 = (1/8)*c // - (1/8)*c
1/2-((1/8)*c) = 0
(-1/8)*c+1/2 = 0
1/2-1/8*c = 0 // - 1/2
-1/8*c = -1/2 // : -1/8
c = -1/2/(-1/8)
c = 4
c = 4
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