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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
1/c = 0.15 // - 0.15
1/c-0.15 = 0
1*c^-1 = 0.15 // : 1
c^-1 = 0.15
-1 < 0
1/(c^1) = 0.15 // * c^1
1 = 0.15*c^1 // : 0.15
6.66666667 = c^1
c = 6.66666667
c = 6.66666667
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