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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2-(5/c) = 7 // - 7
2-(5/c)-7 = 0
2-5*c^-1-7 = 0
-5*c^-1 = 5 // : -5
c^-1 = -1
-1 < 0
1/(c^1) = -1 // * c^1
1 = -1*c^1 // : -1
-1 = c^1
c = -1
c = -1
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