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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/4) = 64 // - 64
x^(3/4)-64 = 0
1*x^(3/4) = 64 // : 1
x^(3/4) = 64
x^(3/4) = 64 // ^ 4
x^3 = 16777216 // ^ 1/3
x = 256
x = 256
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