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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
z^0*x^-7*((2^2*y^-6)/(8^-1)) = 0
x^-7*((2^2*y^-6)/(8^-1)) = 0
32*x^-7*y^-6 = 0 // : 32*y^-6
x^-7 = 0
x należy do O
x belongs to the empty set
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