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