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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
c/5-(2/c) = (7*c+6)/35 // - (7*c+6)/35
c/5-((7*c+6)/35)-(2/c) = 0
c/5-((7*c+6)/35)-2*c^-1 = 0
(-1*(7*c+6))/35+c/5-2/c = 0
(-1*5*c*(7*c+6))/(5*35*c)+(35*c^2)/(5*35*c)+(-2*5*35)/(5*35*c) = 0
35*c^2-1*5*c*(7*c+6)-2*5*35 = 0
-30*c-350 = 0
(-30*c-350)/(5*35*c) = 0
(-30*c-350)/(5*35*c) = 0 // * 5*35*c
-30*c-350 = 0
-30*c-350 = 0 // + 350
-30*c = 350 // : -30
c = 350/(-30)
c = -35/3
c = -35/3
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