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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
325/c = 50/2 // - 50/2
325/c-(50/2) = 0
325/c-25 = 0
325*c^-1 = 25 // : 325
c^-1 = 1/13
-1 < 0
1/(c^1) = 1/13 // * c^1
1 = 1/13*c^1 // : 1/13
13 = c^1
c = 13
c = 13
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