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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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