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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
1.5/c = 15/5 // - 15/5
1.5/c-(15/5) = 0
1.5/c-3 = 0
1.5*c^-1 = 3 // : 1.5
c^-1 = 2
-1 < 0
1/(c^1) = 2 // * c^1
1 = 2*c^1 // : 2
1/2 = c^1
c = 1/2
c = 1/2
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