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