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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3/c-(4/7) = 0
3/c-4/7 = 0
3*c^-1 = 4/7 // : 3
c^-1 = 4/21
-1 < 0
1/(c^1) = 4/21 // * c^1
1 = 4/21*c^1 // : 4/21
21/4 = c^1
c = 21/4
c = 21/4
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