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D( x )
3/x = 0
x = 0
3/x = 0
3/x = 0
3*x^-1 = 0 // : 3
x^-1 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.2-((6/x)/(3/x)) = 0
1.2-2 = 0
-0.8 = 0
x belongs to the empty set
x belongs to the empty set
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