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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-(9/c)-4/2-4*2*9 = 0
-9*c^-1-4/2-4*2*9 = 0
-9*c^-1 = 74 // : -9
c^-1 = -74/9
-1 < 0
1/(c^1) = -74/9 // * c^1
1 = -74/9*c^1 // : -74/9
-9/74 = c^1
c = -9/74
c = -9/74
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