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