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D( x )
x = 0
6*x^-8 = 0
x = 0
x = 0
6*x^-8 = 0
6*x^-8 = 0
6*x^-8 = 0 // : 6
x^-8 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((6*x^-8)^-1)/2 = 0
1/12*x^8 = 0 // : 1/12
x^8 = 0
x = 0
x in { 0}
x belongs to the empty set
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