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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4/15 = 35/c // - 35/c
4/15-(35/c) = 0
4/15-35*c^-1 = 0
-35*c^-1 = -4/15 // : -35
c^-1 = 4/525
-1 < 0
1/(c^1) = 4/525 // * c^1
1 = 4/525*c^1 // : 4/525
525/4 = c^1
c = 525/4
c = 525/4
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