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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/x = 2/x // - 2/x
13/x-(2/x) = 0
13/x-2*x^-1 = 0
11*x^-1 = 0 // : 11
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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