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D( x )
y^-7 = 0
x = 0
y^-7 = 0
y^-7 = 0
y^-7 = 0
x należy do R
x = 0
x = 0
x belongs to the empty set
x^-9*((x^13*y^10)/(y^-7)) = 0
x belongs to the empty set
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