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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
54/c = 9 // - 9
54/c-9 = 0
54*c^-1 = 9 // : 54
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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