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D( x )
9*x^6 = 0
9*x^6 = 0
9*x^6 = 0
9*x^6 = 0 // : 9
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-6*x^5)/(9*x^6) = 0
-2/3*x^-1 = 0 // : -2/3
x^-1 = 0
x należy do O
x belongs to the empty set
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