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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((5/6)/(x^4))/7 = 0
5/42*x^-4 = 0 // : 5/42
x^-4 = 0
x należy do O
x belongs to the empty set
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