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D( x )
x < 0
x < 0
x in <0:+oo)
-2*x^(3/4) = -16 // + 16
16-2*x^(3/4) = 0
-2*x^(3/4) = -16 // : -2
x^(3/4) = 8
( 8 < 0 i 3/4 in (0:1) ) => x należy do O
x belongs to the empty set
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