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D( x )
-4*x = 0
-4*x = 0
-4*x = 0
-4*x = 0 // : -4
x = 0
x in (-oo:0) U (0:+oo)
((-4*x)^-1)/5 = 0
-1/20*x^-1 = 0 // : -1/20
x^-1 = 0
x należy do O
x belongs to the empty set
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