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D( x )
x = 0
7.6/x = 0
x = 0
x = 0
7.6/x = 0
7.6/x = 0
7.6*x^-1 = 0 // : 7.6
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
4.9/(7.6/x) = 0
0.64473684*x = 0 // : 0.64473684
x = 0
x in { 0}
x belongs to the empty set
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