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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 17/x // - 17/x
14/x-(17/x) = 0
14/x-17*x^-1 = 0
-3*x^-1 = 0 // : -3
x^-1 = 0
x należy do O
x belongs to the empty set
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