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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-3*((((20*x^-4)/27)*y^2)/8))/15)*y^-5 = 0
1/162*x^-7*y^-3 = 0 // : 1/162*y^-3
x^-7 = 0
x należy do O
x belongs to the empty set
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