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D( x )
x < 0
x < 0
x in <0:+oo)
0.7 = x^(1/4) // - x^(1/4)
0.7-x^(1/4) = 0
-1*x^(1/4) = -0.7 // : -1
x^(1/4) = 0.7
( 0.7 < 0 i 1/4 in (0:1) ) => x naleu017Cy do O
x belongs to the empty set
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