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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
9/c-17 = 21 // - 21
9/c-21-17 = 0
9*c^-1 = 38 // : 9
c^-1 = 38/9
-1 < 0
1/(c^1) = 38/9 // * c^1
1 = 38/9*c^1 // : 38/9
9/38 = c^1
c = 9/38
c = 9/38
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