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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2 = 4/3-(5/c) // - 4/3-(5/c)
5/c-(4/3)+2 = 0
5/c-4/3+2 = 0
5*c^-1 = -2/3 // : 5
c^-1 = -2/15
-1 < 0
1/(c^1) = -2/15 // * c^1
1 = -2/15*c^1 // : -2/15
-15/2 = c^1
c = -15/2
c = -15/2
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