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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3/4 = 9/c-4 // - 9/c-4
3/4-(9/c)+4 = 0
3/4-9*c^-1+4 = 0
-9*c^-1 = -19/4 // : -9
c^-1 = 19/36
-1 < 0
1/(c^1) = 19/36 // * c^1
1 = 19/36*c^1 // : 19/36
36/19 = c^1
c = 36/19
c = 36/19
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