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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/3 = 12/c // - 12/c
5/3-(12/c) = 0
5/3-12*c^-1 = 0
-12*c^-1 = -5/3 // : -12
c^-1 = 5/36
-1 < 0
1/(c^1) = 5/36 // * c^1
1 = 5/36*c^1 // : 5/36
36/5 = c^1
c = 36/5
c = 36/5
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