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D( x )
(1/2)*x = 0
x = 0
(1/2)*x = 0
(1/2)*x = 0
1/2*x = 0 // : 1/2
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/x)/((1/2)*x) = 0
4*x^-2 = 0 // : 4
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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