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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(2*c)/c-4-2 = 4/c+5 // - 4/c+5
(2*c)/c-(4/c)-5-4-2 = 0
(2*c)/c-4*c^-1-5-4-2 = 0
-4*c^-1 = 9 // : -4
c^-1 = -9/4
-1 < 0
1/(c^1) = -9/4 // * c^1
1 = -9/4*c^1 // : -9/4
-4/9 = c^1
c = -4/9
c = -4/9
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