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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
17/c = 6 // - 6
17/c-6 = 0
17*c^-1 = 6 // : 17
c^-1 = 6/17
-1 < 0
1/(c^1) = 6/17 // * c^1
1 = 6/17*c^1 // : 6/17
17/6 = c^1
c = 17/6
c = 17/6
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