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D( x )
(9*a^-4*b^4)/(10*a^4*b^-5) = 0
10*a^4*b^-5 = 0
(9*a^-4*b^4)/(10*a^4*b^-5) = 0
(9*a^-4*b^4)/(10*a^4*b^-5) = 0
9/10*a^-8*b^9 = 0
x należy do R
10*a^4*b^-5 = 0
10*a^4*b^-5 = 0
10*a^4*b^-5 = 0
x należy do R
x belongs to the empty set
((9*a^-4*b^4)/(10*a^4*b^-5))^0 = 0
x belongs to the empty set
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