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D( c )
-c = 0
-c = 0
c = 0
c in (-oo:0) U (0:+oo)
14 = 70/(-c) // - 70/(-c)
14-(70/(-c)) = 0
70*c^-1+14 = 0
70*c^-1 = -14 // : 70
c^-1 = -1/5
-1 < 0
1/(c^1) = -1/5 // * c^1
1 = -1/5*c^1 // : -1/5
-5 = c^1
c = -5
c = -5
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