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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-5*((15*x^-2*y^4)/((-3)^2))*y^8 = 0
5/3*x^-7*y^12 = 0 // : 5/3*y^12
x^-7 = 0
x należy do O
x belongs to the empty set
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