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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 5/x // - 5/x
3/x-(5/x) = 0
3/x-5*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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