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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
184/(3*x) = 0
184/3*x^-1 = 0 // : 184/3
x^-1 = 0
x należy do O
x belongs to the empty set
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