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D( y )
-27*y = 0
-27*y = 0
-27*y = 0
-27*y = 0 // : -27
y = 0
y in (-oo:0) U (0:+oo)
18/(-27*y) = 0
-2/3*y^-1 = 0 // : -2/3
y^-1 = 0
y należy do O
y belongs to the empty set
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