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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3 = -5/x-3 // + -5/x-3
3-(-5/x)-3 = 0
5*x^-1-3+3 = 0
5*x^-1 = 0 // : 5
x^-1 = 0
x należy do O
x belongs to the empty set
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