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