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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3 = 7-(5/c) // - 7-(5/c)
5/c-7+3 = 0
5*c^-1 = 4 // : 5
c^-1 = 4/5
-1 < 0
1/(c^1) = 4/5 // * c^1
1 = 4/5*c^1 // : 4/5
5/4 = c^1
c = 5/4
c = 5/4
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