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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
325/50 = 2/c // - 2/c
325/50-(2/c) = 0
325/50-2*c^-1 = 0
-2*c^-1 = -13/2 // : -2
c^-1 = 13/4
-1 < 0
1/(c^1) = 13/4 // * c^1
1 = 13/4*c^1 // : 13/4
4/13 = c^1
c = 4/13
c = 4/13
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