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D( c )
2*c-(2*c)+1/1 = 0
2*c-(2*c)+1/1 = 0
2*c-(2*c)+1/1 = 0
2*c-2*c+1 = 0
1 = 0
c belongs to the empty set
c in (-oo:+oo)
(3*c-((7/2)*c)+1)/(2*c-(2*c)+1/1) = 0
(3*c+(-7/2)*c+1)/(2*c-2*c+1) = 0
(1-1/2*c)/1 = 0
1-1/2*c = 0 // - 1
-1/2*c = -1 // : -1/2
c = -1/(-1/2)
c = 2
c = 2
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