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