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D( x )
-81*a^20*b^8 = 0
-81*a^20*b^8 = 0
-81*a^20*b^8 = 0
-81*a^20*b^8 = 0
x należy do R
x belongs to the empty set
((3*a^5*b^3)^4)/(-81*a^20*b^8) = 0
x belongs to the empty set
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