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D( x )
(8/9)*x = 0
(8/9)*x = 0
(8/9)*x = 0
8/9*x = 0 // : 8/9
x = 0
x in (-oo:0) U (0:+oo)
4/((8/9)*x) = 0
9/2*x^-1 = 0 // : 9/2
x^-1 = 0
x należy do O
x belongs to the empty set
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