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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/c = 25/35 // - 25/35
5/c-(25/35) = 0
5/c-5/7 = 0
5*c^-1 = 5/7 // : 5
c^-1 = 1/7
-1 < 0
1/(c^1) = 1/7 // * c^1
1 = 1/7*c^1 // : 1/7
7 = c^1
c = 7
c = 7
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