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c in (-oo:+oo)
c/(-2) = 0.43 // - 0.43
c/(-2)-0.43 = 0
-1/2*c-0.43 = 0 // + 0.43
-1/2*c = 0.43 // : -1/2
c = 0.43/(-1/2)
c = -0.86
c = -0.86
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