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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/c = 7 // - 7
2/c-7 = 0
2*c^-1 = 7 // : 2
c^-1 = 7/2
-1 < 0
1/(c^1) = 7/2 // * c^1
1 = 7/2*c^1 // : 7/2
2/7 = c^1
c = 2/7
c = 2/7
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