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D( x )
(2/3)*x-(1/3) = 0
(2/3)*x-(1/3) = 0
(2/3)*x-(1/3) = 0
(2/3)*x-1/3 = 0
2/3*x-1/3 = 0 // + 1/3
2/3*x = 1/3 // : 2/3
x = 1/3/2/3
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(((2/3)*x-(1/3))^-1)/3 = 0
(((2/3)*x-1/3)^-1)/3 = 0
1/(3*(2/3*x-1/3)) = 0
x belongs to the empty set
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