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D( y )
4*y = 0
4*y = 0
4*y = 0
4*y = 0 // : 4
y = 0
y in (-oo:0) U (0:+oo)
1/(4*y) = 0
1/4*y^-1 = 0 // : 1/4
y^-1 = 0
y należy do O
y belongs to the empty set
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