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D( c )
c+2 = 0
c+2 = 0
c+2 = 0
c+2 = 0 // - 2
c = -2
c in (-oo:-2) U (-2:+oo)
(2*c^3+16)/(c+2) = 0
2*c^3 = -16 // : 2
c^3 = -8
c^3 = -8 // ^ 1/3
c = -2
c in { -2}
c belongs to the empty set
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