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D( x )
(x^5)/11 = 0
(x^5)/11 = 0
(x^5)/11 = 0
1/11*x^5 = 0 // : 1/11
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
6/((x^5)/11) = 0
66*x^-5 = 0 // : 66
x^-5 = 0
x należy do O
x belongs to the empty set
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