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D( x )
30*x = 0
30*x = 0
30*x = 0
30*x = 0 // : 30
x = 0
x in (-oo:0) U (0:+oo)
120/(30*x) = 0
4*x^-1 = 0 // : 4
x^-1 = 0
x należy do O
x belongs to the empty set
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