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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(-1/5)/c = 35 // - 35
(-1/5)/c-35 = 0
-1/5*c^-1 = 35 // : -1/5
c^-1 = -175
-1 < 0
1/(c^1) = -175 // * c^1
1 = -175*c^1 // : -175
-1/175 = c^1
c = -1/175
c = -1/175
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