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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
35/c+2 = 0
35*c^-1 = -2 // : 35
c^-1 = -2/35
-1 < 0
1/(c^1) = -2/35 // * c^1
1 = -2/35*c^1 // : -2/35
-35/2 = c^1
c = -35/2
c = -35/2
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