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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5 = 10/c // - 10/c
5-(10/c) = 0
5-10*c^-1 = 0
-10*c^-1 = -5 // : -10
c^-1 = 1/2
-1 < 0
1/(c^1) = 1/2 // * c^1
1 = 1/2*c^1 // : 1/2
2 = c^1
c = 2
c = 2
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