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D( y )
y^3 = 0
y^3 = 0
y^3 = 0
1*y^3 = 0 // : 1
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
(((y^2)/5)/(y^3))/15 = 0
1/75*y^-1 = 0 // : 1/75
y^-1 = 0
y należy do O
y belongs to the empty set
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