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D( x )
64*x < 0
64*x < 0
64*x < 0
64*x+0 < 0 // - 0
64*x < 0 // : 64
x < 0/64
x < 0
x in <0:+oo)
(64*x)^(3/4) = 0
64^(3/4)*x^(3/4) = 0 // : 64^(3/4)
x^(3/4) = 0
x = 0
x = 0
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