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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
27/3 = 9/c // - 9/c
27/3-(9/c) = 0
27/3-9*c^-1 = 0
-9*c^-1 = -9 // : -9
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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