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D( x )
40*w^7*y^4 = 0
40*w^7*y^4 = 0
40*w^7*y^4 = 0
40*w^7*y^4 = 0
x należy do R
x belongs to the empty set
(20*w^4*y^4)/(40*w^7*y^4) = 0
x belongs to the empty set
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