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