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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
6/15 = 2/c // - 2/c
6/15-(2/c) = 0
6/15-2*c^-1 = 0
-2*c^-1 = -2/5 // : -2
c^-1 = 1/5
-1 < 0
1/(c^1) = 1/5 // * c^1
1 = 1/5*c^1 // : 1/5
5 = c^1
c = 5
c = 5
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