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D( C )
C = 0
C = 0
C = 0
C in (-oo:0) U (0:+oo)
5/8 = 2.5/C // - 2.5/C
5/8-(2.5/C) = 0
5/8-2.5*C^-1 = 0
-2.5*C^-1 = -5/8 // : -2.5
C^-1 = 0.25
-1 < 0
1/(C^1) = 0.25 // * C^1
1 = 0.25*C^1 // : 0.25
4 = C^1
C = 4
C = 4
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