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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23/x = 8/x // - 8/x
23/x-(8/x) = 0
23/x-8*x^-1 = 0
15*x^-1 = 0 // : 15
x^-1 = 0
x należy do O
x belongs to the empty set
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