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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
36/c = 8/6 // - 8/6
36/c-(8/6) = 0
36/c-4/3 = 0
36*c^-1 = 4/3 // : 36
c^-1 = 1/27
-1 < 0
1/(c^1) = 1/27 // * c^1
1 = 1/27*c^1 // : 1/27
27 = c^1
c = 27
c = 27
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