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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
24/c = 3 // - 3
24/c-3 = 0
24*c^-1 = 3 // : 24
c^-1 = 1/8
-1 < 0
1/(c^1) = 1/8 // * c^1
1 = 1/8*c^1 // : 1/8
8 = c^1
c = 8
c = 8
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