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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-12/c-6 = 0
-12*c^-1 = 6 // : -12
c^-1 = -1/2
-1 < 0
1/(c^1) = -1/2 // * c^1
1 = -1/2*c^1 // : -1/2
-2 = c^1
c = -2
c = -2
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