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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
11/7 = 88/c // - 88/c
11/7-(88/c) = 0
11/7-88*c^-1 = 0
-88*c^-1 = -11/7 // : -88
c^-1 = 1/56
-1 < 0
1/(c^1) = 1/56 // * c^1
1 = 1/56*c^1 // : 1/56
56 = c^1
c = 56
c = 56
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