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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
125 = (25*156)/c // - (25*156)/c
125-((25*156)/c) = 0
125-3900*c^-1 = 0
-3900*c^-1 = -125 // : -3900
c^-1 = 5/156
-1 < 0
1/(c^1) = 5/156 // * c^1
1 = 5/156*c^1 // : 5/156
156/5 = c^1
c = 156/5
c = 156/5
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