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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/14 = 36/c // - 36/c
5/14-(36/c) = 0
5/14-36*c^-1 = 0
-36*c^-1 = -5/14 // : -36
c^-1 = 5/504
-1 < 0
1/(c^1) = 5/504 // * c^1
1 = 5/504*c^1 // : 5/504
504/5 = c^1
c = 504/5
c = 504/5
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