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