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D( x )
x = 0
(2*x)/x-7 <= 0
x = 0
x = 0
(2*x)/x-7 <= 0
(2*x)/x-7 <= 0
-5 <= 0
x należy do R
x belongs to the empty set
ln((2*x)/x-7) = 1
x belongs to the empty set
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