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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 64/x // - 64/x
1/x-(64/x) = 0
1/x-64*x^-1 = 0
-63*x^-1 = 0 // : -63
x^-1 = 0
x należy do O
x belongs to the empty set
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