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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7/c = 63/54 // - 63/54
7/c-(63/54) = 0
7/c-7/6 = 0
7*c^-1 = 7/6 // : 7
c^-1 = 1/6
-1 < 0
1/(c^1) = 1/6 // * c^1
1 = 1/6*c^1 // : 1/6
6 = c^1
c = 6
c = 6
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