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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
18/c = 4 // - 4
18/c-4 = 0
18*c^-1 = 4 // : 18
c^-1 = 2/9
-1 < 0
1/(c^1) = 2/9 // * c^1
1 = 2/9*c^1 // : 2/9
9/2 = c^1
c = 9/2
c = 9/2
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