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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
x^(-3/2) = 1/729 // - 1/729
x^(-3/2)-(1/729) = 0
x^(-3/2)-1/729 = 0
1*x^(-3/2) = 1/729 // : 1
x^(-3/2) = 1/729
-3/2 < 0
1/(x^(3/2)) = 1/729 // * x^(3/2)
1 = 1/729*x^(3/2) // : 1/729
729 = x^(3/2)
x^(3/2) = 729 // ^ 2
x^3 = 531441 // ^ 1/3
x = 81
x = 81
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