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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3.4/c = 10 // - 10
3.4/c-10 = 0
3.4*c^-1 = 10 // : 3.4
c^-1 = 2.94117647
-1 < 0
1/(c^1) = 2.94117647 // * c^1
1 = 2.94117647*c^1 // : 2.94117647
0.34 = c^1
c = 0.34
c = 0.34
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