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D( x )
a^9*((2*a^-8*b^9)/13)*b^-2 = 0
a^9*((2*a^-8*b^9)/13)*b^-2 = 0
a^9*((2*a^-8*b^9)/13)*b^-2 = 0
2/13*a*b^7 = 0
x należy do R
x belongs to the empty set
(a^9*((2*a^-8*b^9)/13)*b^-2)^0 = 0
x belongs to the empty set
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