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D( x )
3*w = 0
9*w^9 = 0
3*w = 0
3*w = 0
3*w = 0
x należy do R
9*w^9 = 0
9*w^9 = 0
9*w^9 = 0
x należy do R
x belongs to the empty set
4/(3*w) = x/(9*w^9)
x belongs to the empty set
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