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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-8*((3^-7*x^5*y^3)/(3^-4))*y^6 = 0
1/27*x^-3*y^9 = 0 // : 1/27*y^9
x^-3 = 0
x należy do O
x belongs to the empty set
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