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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
c+3/c-8 = c-(4/c)+5 // - c-(4/c)+5
c-c+3/c+4/c-8-5 = 0
7*c^-1 = 13 // : 7
c^-1 = 13/7
-1 < 0
1/(c^1) = 13/7 // * c^1
1 = 13/7*c^1 // : 13/7
7/13 = c^1
c = 7/13
c = 7/13
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