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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
96/c = 1 // - 1
96/c-1 = 0
96*c^-1 = 1 // : 96
c^-1 = 1/96
-1 < 0
1/(c^1) = 1/96 // * c^1
1 = 1/96*c^1 // : 1/96
96 = c^1
c = 96
c = 96
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