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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-7*((((((3*x^5)/5)*y^3)/6)*y^-4)/5) = 0
1/50*x^-2*y^-1 = 0 // : 1/50*y^-1
x^-2 = 0
x należy do O
x belongs to the empty set
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