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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3/c-(2/5) = 0
3/c-2/5 = 0
3*c^-1 = 2/5 // : 3
c^-1 = 2/15
-1 < 0
1/(c^1) = 2/15 // * c^1
1 = 2/15*c^1 // : 2/15
15/2 = c^1
c = 15/2
c = 15/2
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