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