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D( x )
x < 0
x < 0
x in <0:+oo)
20 = x^(19/4) // - x^(19/4)
20-x^(19/4) = 0
-1*x^(19/4) = -20 // : -1
x^(19/4) = 20
x^(19/4) = 20 // ^ 4
x^19 = 160000 // ^ 1/19
x = 160000^(1/19)
x = 160000^(1/19)
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