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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
9/c+4 = 5/2 // - 5/2
9/c-(5/2)+4 = 0
9/c-5/2+4 = 0
9*c^-1 = -3/2 // : 9
c^-1 = -1/6
-1 < 0
1/(c^1) = -1/6 // * c^1
1 = -1/6*c^1 // : -1/6
-6 = c^1
c = -6
c = -6
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