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D( c )
c-6 = 0
c-6 = 0
c-6 = 0
c-6 = 0 // + 6
c = 6
c in (-oo:6) U (6:+oo)
6/(c-6) = -1/4 // + -1/4
6/(c-6)-(-1/4) = 0
6/(c-6)+1/4 = 0
(4*6)/(4*(c-6))+(1*(c-6))/(4*(c-6)) = 0
1*(c-6)+4*6 = 0
c+18 = 0
(c+18)/(4*(c-6)) = 0
(c+18)/(4*(c-6)) = 0 // * 4*(c-6)
c+18 = 0
c+18 = 0 // - 18
c = -18
c = -18
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