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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3/8 = 11/c // - 11/c
3/8-(11/c) = 0
3/8-11*c^-1 = 0
-11*c^-1 = -3/8 // : -11
c^-1 = 3/88
-1 < 0
1/(c^1) = 3/88 // * c^1
1 = 3/88*c^1 // : 3/88
88/3 = c^1
c = 88/3
c = 88/3
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