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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-126 = 14/c // - 14/c
-(14/c)-126 = 0
-14*c^-1-126 = 0
-14*c^-1 = 126 // : -14
c^-1 = -9
-1 < 0
1/(c^1) = -9 // * c^1
1 = -9*c^1 // : -9
-1/9 = c^1
c = -1/9
c = -1/9
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