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D( x )
x < 0
x < 0
x in <0:+oo)
2500 = x^(9/10) // - x^(9/10)
2500-x^(9/10) = 0
-1*x^(9/10) = -2500 // : -1
x^(9/10) = 2500
( 2500 < 0 i 9/10 in (0:1) ) => x należy do O
x belongs to the empty set
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