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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1/x = 0.5/x // - 0.5/x
0.1/x-(0.5/x) = 0
0.1/x-0.5*x^-1 = 0
-0.4*x^-1 = 0 // : -0.4
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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