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D( c )
7*c+4 = 0
2*c-3 = 0
7*c+4 = 0
7*c+4 = 0
7*c+4 = 0 // - 4
7*c = -4 // : 7
c = -4/7
2*c-3 = 0
2*c-3 = 0
2*c-3 = 0 // + 3
2*c = 3 // : 2
c = 3/2
c in (-oo:-4/7) U (-4/7:3/2) U (3/2:+oo)
5/(2*c-3) = 3/(7*c+4) // - 3/(7*c+4)
5/(2*c-3)-(3/(7*c+4)) = 0
5/(2*c-3)-3*(7*c+4)^-1 = 0
5/(2*c-3)-3/(7*c+4) = 0
(5*(7*c+4))/((2*c-3)*(7*c+4))+(-3*(2*c-3))/((2*c-3)*(7*c+4)) = 0
5*(7*c+4)-3*(2*c-3) = 0
29*c+29 = 0
(29*c+29)/((2*c-3)*(7*c+4)) = 0
(29*c+29)/((2*c-3)*(7*c+4)) = 0 // * (2*c-3)*(7*c+4)
29*c+29 = 0
29*c+29 = 0 // - 29
29*c = -29 // : 29
c = -29/29
c = -1
c = -1
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