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D( x )
0.5*x = 0
0.5*x = 0
0.5*x = 0
0.5*x = 0 // : 0.5
x = 0
x in (-oo:0) U (0:+oo)
10000/(0.5*x) = 0
20000*x^-1 = 0 // : 20000
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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