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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7/c = 5/9 // - 5/9
7/c-(5/9) = 0
7/c-5/9 = 0
7*c^-1 = 5/9 // : 7
c^-1 = 5/63
-1 < 0
1/(c^1) = 5/63 // * c^1
1 = 5/63*c^1 // : 5/63
63/5 = c^1
c = 63/5
c = 63/5
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