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D( c )
c = 0
2*c = 0
c = 0
c = 0
2*c = 0
2*c = 0
2*c = 0 // : 2
c = 0
c in (-oo:0) U (0:+oo)
4/c = 3/(2*c)-(1/5) // - 3/(2*c)-(1/5)
4/c-(3/(2*c))+1/5 = 0
4/c+(-3/2)*c^-1+1/5 = 0
5/2*c^-1 = -1/5 // : 5/2
c^-1 = -2/25
-1 < 0
1/(c^1) = -2/25 // * c^1
1 = -2/25*c^1 // : -2/25
-25/2 = c^1
c = -25/2
c = -25/2
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