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D( x )
8*a^-3*b^7 = 0
8*a^-3*b^7 = 0
8*a^-3*b^7 = 0
8*a^-3*b^7 = 0
x należy do R
x belongs to the empty set
(12*a^2*b^2)/(8*a^-3*b^7) = 0
x belongs to the empty set
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