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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
125/c = 9 // - 9
125/c-9 = 0
125*c^-1 = 9 // : 125
c^-1 = 9/125
-1 < 0
1/(c^1) = 9/125 // * c^1
1 = 9/125*c^1 // : 9/125
125/9 = c^1
c = 125/9
c = 125/9
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