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D( x )
b^4*u^3-(b^3*u^7) = 0
b^4*u^3-(b^3*u^7) = 0
b^4*u^3-(b^3*u^7) = 0
b^4*u^3-(b^3*u^7) = 0
x należy do R
x belongs to the empty set
(b^7*u^6)/(b^4*u^3-(b^3*u^7)) = 0
x belongs to the empty set
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